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| Port | TCP | UDP | Description | Status |
|---|---|---|---|---|
| 0 | UDP | Reserved | Official | |
| 1 | TCP | UDP | TCP Port Service Multiplexer (TCPMUX) | Official |
| 2 | TCP | UDP | CompressNET[2] Management Utility[3] | Official |
| 3 | TCP | UDP | CompressNET[2] Compression Process[4] | Official |
| 4 | TCP | UDP | Unassigned | Official |
| 5 | TCP | UDP | Remote Job Entry | Official |
| 7 | TCP | UDP | Echo Protocol | Official |
| 8 | TCP | UDP | Unassigned | Official |
| 9 | TCP | UDP | Discard Protocol | Official |
| 10 | TCP | UDP | Unassigned | Official |
| 11 | TCP | UDP | Active Users (systat service)[5][6] | Official |
| 12 | TCP | UDP | Unassigned | Official |
| 13 | TCP | UDP | Daytime Protocol (RFC 867) | Official |
| 14 | TCP | UDP | Unassigned | Official |
| 15 | TCP | UDP | Previously netstat service[5] | Unofficial |
| 16 | TCP | UDP | Unassigned | Official |
| 17 | TCP | UDP | Quote of the Day | Official |
| 18 | TCP | UDP | Message Send Protocol | Official |
| 19 | TCP | UDP | Character Generator Protocol (CHARGEN) | Official |
| 20 | TCP | FTP—data transfer | Official | |
| 21 | TCP | FTP—control (command) | Official | |
| 22 | TCP | UDP | Secure Shell (SSH)—used for secure logins, file transfers (scp, sftp) and port forwarding | Official |
| 23 | TCP | Telnet protocol—unencrypted text communications | Official | |
| 24 | TCP | UDP | Priv-mail : any private mail system.[citation needed] | Official |
| 25 | TCP | Simple Mail Transfer Protocol (SMTP)—used for e-mail routing between mail servers | Official | |
| 26 | TCP | UDP | Unassigned | Official |
| 27 | TCP | UDP | NSW User System FE[citation needed] | Official |
| 29 | TCP | UDP | MSG ICP[citation needed] | Official |
| 33 | TCP | UDP | Display Support Protocol[citation needed] | Official |
| 34 | TCP | UDP | Remote File (RF)—used to transfer files between machines[citation needed] | Unofficial |
| 35 | TCP | UDP | Any private printer server protocol[citation needed] | Official |
| 37 | TCP | UDP | TIME protocol | Official |
| 39 | TCP | UDP | Resource Location Protocol[7] (RLP)—used for determining the location of higher level services from hosts on a network | Official |
| 40 | TCP | UDP | Unassigned | Official |
| 41 | TCP | UDP | Graphics[citation needed] | Official |
| 42 | TCP | UDP | ARPA Host Name Server Protocol | Official |
| 42 | TCP | UDP | Windows Internet Name Service | Unofficial |
| 43 | TCP | WHOIS protocol | Official | |
| 47 | TCP | UDP | NI FTP[7] | Official |
| 49 | TCP | UDP | TACACS Login Host protocol[citation needed] | Official |
| 50 | TCP | UDP | Remote Mail Checking Protocol[8] | Official |
| 51 | TCP | UDP | IMP Logical Address Maintenance[citation needed] | Official |
| 52 | TCP | UDP | XNS (Xerox Network Systems) Time Protocol | Official |
| 53 | TCP | UDP | Domain Name System (DNS) | Official |
| 54 | TCP | UDP | XNS (Xerox Network Systems) Clearinghouse | Official |
| 55 | TCP | UDP | ISI Graphics Language (ISI-GL)[citation needed] | Official |
| 56 | TCP | UDP | Route Access Protocol (RAP)[9] | Unofficial |
| 56 | TCP | UDP | XNS (Xerox Network Systems) Authentication | Official |
| 57 | TCP | Mail Transfer Protocol (RFC 780) | Unofficial | |
| 58 | TCP | UDP | XNS (Xerox Network Systems) Mail | Official |
| 67 | UDP | Bootstrap Protocol (BOOTP) Server; also used by Dynamic Host Configuration Protocol (DHCP) | Official | |
| 68 | UDP | Bootstrap Protocol (BOOTP) Client; also used by Dynamic Host Configuration Protocol (DHCP) | Official | |
| 69 | UDP | Trivial File Transfer Protocol (TFTP) | Official | |
| 70 | TCP | Gopher protocol | Official | |
| 71 | TCP | NETRJS protocol | Official | |
| 72 | TCP | NETRJS protocol | Official | |
| 73 | TCP | NETRJS protocol | Official | |
| 74 | TCP | NETRJS protocol | Official | |
| 79 | TCP | Finger protocol | Official | |
| 80 | TCP | UDP | Hypertext Transfer Protocol (HTTP) | Official |
| 81 | TCP | Torpark—Onion routing | Unofficial | |
| 82 | UDP | Torpark—Control | Unofficial | |
| 83 | TCP | MIT ML Device[citation needed] | Official | |
| 88 | TCP | UDP | Kerberos—authentication system[citation needed] | Official |
| 90 | TCP | UDP | dnsix (DoD Network Security for Information Exchange) Securit Attribute Token Map[citation needed] | Official |
| 90 | TCP | UDP | Pointcast | Unofficial |
| 99 | TCP | WIP Message protocol | Unofficial | |
| 101 | TCP | NIC host name | Official | |
| 102 | TCP | ISO-TSAP (Transport Service Access Point) Class 0 protocol[10] | Official | |
| 104 | TCP | UDP | ACR/NEMA Digital Imaging and Communications in Medicine | Official |
| 105 | TCP | UDP | CCSO Nameserver Protocol (Qi/Ph) | Official |
| 107 | TCP | Remote TELNET Service[11] protocol | Official | |
| 108 | TCP | UDP | SNA Gateway Access Server [12] | Official |
| 109 | TCP | Post Office Protocol v2 (POP2) | Official | |
| 110 | TCP | Post Office Protocol v3 (POP3) | Official | |
| 111 | TCP | UDP | ONC RPC (SunRPC) | Official |
| 113 | UDP | Authentication Service[13] (auth) | Official | |
| 113 | TCP | ident—Authentication Service/Identification Protocol,[13] used by IRC servers to identify users | Official | |
| 115 | TCP | Simple File Transfer Protocol (SFTP) | Official | |
| 117 | TCP | UUCP Path Service | Official | |
| 118 | TCP | UDP | SQL (Structured Query Language) Services | Official |
| 119 | TCP | Network News Transfer Protocol (NNTP)—retrieval of newsgroup messages | Official | |
| 123 | UDP | Network Time Protocol (NTP)—used for time synchronization | Official | |
| 135 | TCP | UDP | Microsoft EPMAP (End Point Mapper), also known as DCE/RPC Locator service,[14] used to remotely manage services including DHCP server, DNS server and WINS. Also used by DCOM | Unofficial |
| 135 | TCP | UDP | DCE endpoint resolution | Official |
| 137 | TCP | UDP | NetBIOS NetBIOS Name Service | Official |
| 138 | TCP | UDP | NetBIOS NetBIOS Datagram Service | Official |
| 139 | TCP | UDP | NetBIOS NetBIOS Session Service | Official |
| 143 | TCP | Internet Message Access Protocol (IMAP)—management of email messages | Official | |
| 152 | TCP | UDP | Background File Transfer Program (BFTP)[15] | Official |
| 153 | TCP | UDP | SGMP, Simple Gateway Monitoring Protocol | Official |
| 156 | TCP | UDP | SQL Service | Official |
| 158 | TCP | UDP | DMSP, Distributed Mail Service Protocol[16] | Unofficial |
| 161 | UDP | Simple Network Management Protocol (SNMP) | Official | |
| 162 | TCP | UDP | Simple Network Management Protocol Trap (SNMPTRAP)[17] | Official |
| 170 | TCP | Print-srv, Network PostScript[citation needed] | Official | |
| 175 | TCP | VMNET (IBM z/VM, z/OS & z/VSE - Network Job Entry(NJE))[citation needed] | Official | |
| 177 | TCP | UDP | X Display Manager Control Protocol (XDMCP) | Official |
| 179 | TCP | BGP (Border Gateway Protocol) | Official | |
| 194 | TCP | UDP | Internet Relay Chat (IRC) | Official |
| 199 | TCP | UDP | SMUX, SNMP Unix Multiplexer | Official |
| 201 | TCP | UDP | AppleTalk Routing Maintenance | Official |
| 209 | TCP | UDP | The Quick Mail Transfer Protocol | Official |
| 210 | TCP | UDP | ANSI Z39.50 | Official |
| 213 | TCP | UDP | Internetwork Packet Exchange (IPX) | Official |
| 218 | TCP | UDP | Message posting protocol (MPP) | Official |
| 220 | TCP | UDP | Internet Message Access Protocol (IMAP), version 3 | Official |
| 256 | TCP | UDP | 2DEV "2SP" Port[citation needed] | Unofficial |
| 259 | TCP | UDP | ESRO, Efficient Short Remote Operations[citation needed] | Official |
| 264 | TCP | UDP | BGMP, Border Gateway Multicast Protocol | Official |
| 280 | TCP | UDP | http-mgmt | Official |
| 308 | TCP | Novastor Online Backup | Official | |
| 311 | TCP | Mac OS X Server Admin (officially AppleShare IP Web administration)[citation needed] | Official | |
| 318 | TCP | UDP | PKIX TSP, Time Stamp Protocol | Official |
| 319 | UDP | Precision time protocol event messages | Official | |
| 320 | UDP | Precision time protocol general messages | Official | |
| 323 | TCP | UDP | IMMP, Internet Message Mapping Protocol[citation needed] | Unofficial |
| 350 | TCP | UDP | MATIP-Type A, Mapping of Airline Traffic over Internet Protocol[citation needed] | Official |
| 351 | TCP | UDP | MATIP-Type B, Mapping of Airline Traffic over Internet Protocol[citation needed] | Official |
| 366 | TCP | UDP | ODMR, On-Demand Mail Relay[citation needed] | Official |
| 369 | TCP | UDP | Rpc2portmap[citation needed] | Official |
| 370 | TCP | codaauth2—Coda authentication server[citation needed] | Official | |
| 370 | UDP | securecast1—Outgoing packets to NAI's servers [18][dead link] | Unofficial | |
| 370 | UDP | codaauth2—Coda authentication server[citation needed] | Official | |
| 371 | TCP | UDP | ClearCase albd[citation needed] | Official |
| 383 | TCP | UDP | HP data alarm manager[citation needed] | Official |
| 384 | TCP | UDP | A Remote Network Server System[citation needed] | Official |
| 387 | TCP | UDP | AURP, AppleTalk Update-based Routing Protocol[19] | Official |
| 389 | TCP | UDP | Lightweight Directory Access Protocol (LDAP) | Official |
| 401 | TCP | UDP | UPS Uninterruptible Power Supply[citation needed] | Official |
| 402 | TCP | Altiris, Altiris Deployment Client[citation needed] | Unofficial | |
| 411 | TCP | Direct Connect Hub | Unofficial | |
| 412 | TCP | Direct Connect Client-to-Client | Unofficial | |
| 427 | TCP | UDP | Service Location Protocol (SLP) | Official |
| 443 | TCP | HTTPS (Hypertext Transfer Protocol over SSL/TLS) | Official | |
| 444 | TCP | UDP | SNPP, Simple Network Paging Protocol (RFC 1568) | Official |
| 445 | TCP | Microsoft-DS Active Directory, Windows shares | Official | |
| 445 | TCP | Microsoft-DS SMB file sharing | Official | |
| 464 | TCP | UDP | Kerberos Change/Set password | Official |
| 465 | TCP | SMTP over SSL | Unofficial | |
| 465 | TCP | Cisco protocol[citation needed] | Unofficial | |
| 475 | TCP | UDP | tcpnethaspsrv (Aladdin Knowledge Systems Hasp services, TCP/IP version)[citation needed] | Official |
| 497 | TCP | Dantz Retrospect | Official | |
| 500 | UDP | Internet Security Association and Key Management Protocol (ISAKMP) | Official | |
| 500 | TCP | Qmatic Qwin communication port[citation needed] | Unofficial | |
| 501 | TCP | STMF, Simple Transportation Management Framework—DOT NTCIP 1101[citation needed] | Unofficial | |
| 502 | TCP | UDP | Modbus, Protocol | Unofficial |
| 502 | TCP | UDP | asa-appl-proto, Protocol[citation needed] | Unofficial |
| 504 | TCP | UDP | Citadel—multiservice protocol for dedicated clients for the Citadel groupware system | Official |
| 510 | TCP | First Class Protocol[citation needed] | Unofficial | |
| 512 | UDP | comsat, together with biff | Official | |
| 512 | TCP | Rexec, Remote Process Execution | Official | |
| 513 | TCP | rlogin | Official | |
| 513 | UDP | Who[citation needed] | Official | |
| 514 | TCP | Shell—used to execute non-interactive commands on a remote system (Remote Shell, rsh, remsh) | Official | |
| 514 | UDP | Syslog—used for system logging | Official | |
| 515 | TCP | Line Printer Daemon—print service | Official | |
| 517 | UDP | Talk[citation needed] | Official | |
| 518 | UDP | NTalk[citation needed] | Official | |
| 520 | UDP | Routing Information Protocol (RIP) | Official | |
| 520 | TCP | efs, extended file name server[citation needed] | Official | |
| 524 | TCP | UDP | NetWare Core Protocol (NCP) is used for a variety things such as access to primary NetWare server resources, Time Synchronization, etc. | Official |
| 525 | UDP | Timed, Timeserver[citation needed] | Official | |
| 530 | TCP | UDP | RPC[citation needed] | Official |
| 531 | TCP | UDP | AOL Instant Messenger | Unofficial |
| 532 | TCP | netnews[citation needed] | Official | |
| 533 | UDP | netwall, For Emergency Broadcasts[citation needed] | Official | |
| 540 | TCP | UUCP (Unix-to-Unix Copy Protocol) | Official | |
| 542 | TCP | UDP | commerce (Commerce Applications)[citation needed] | Official |
| 543 | TCP | klogin, Kerberos login | Official | |
| 544 | TCP | kshell, Kerberos Remote shell | Official | |
| 545 | TCP | OSIsoft PI (VMS), OSISoft PI Server Client Access | Unofficial | |
| 546 | TCP | UDP | DHCPv6 client | Official |
| 547 | TCP | UDP | DHCPv6 server | Official |
| 548 | TCP | Apple Filing Protocol (AFP) over TCP | Official | |
| 550 | UDP | new-rwho, new-who[citation needed] | Official | |
| 554 | TCP | UDP | Real Time Streaming Protocol (RTSP) | Official |
| 556 | TCP | Remotefs, RFS, rfs_server | Official | |
| 560 | UDP | rmonitor, Remote Monitor[citation needed] | Official | |
| 561 | UDP | monitor[citation needed] | Official | |
| 563 | TCP | UDP | NNTP protocol over TLS/SSL (NNTPS) | Official |
| 587 | TCP | e-mail message submission[20] (SMTP) | Official | |
| 591 | TCP | FileMaker 6.0 (and later) Web Sharing (HTTP Alternate, also see port 80) | Official | |
| 593 | TCP | UDP | HTTP RPC Ep Map, Remote procedure call over Hypertext Transfer Protocol, often used by Distributed Component Object Model services and Microsoft Exchange Server | Official |
| 604 | TCP | TUNNEL profile,[21] a protocol for BEEP peers to form an application layer tunnel | Official | |
| 623 | UDP | ASF Remote Management and Control Protocol (ASF-RMCP)[citation needed] | Official | |
| 631 | TCP | UDP | Internet Printing Protocol (IPP) | Official |
| 631 | TCP | UDP | Common Unix Printing System (CUPS) | Unofficial |
| 635 | TCP | UDP | RLZ DBase[citation needed] | Official |
| 636 | TCP | UDP | Lightweight Directory Access Protocol over TLS/SSL (LDAPS) | Official |
| 639 | TCP | UDP | MSDP, Multicast Source Discovery Protocol | Official |
| 641 | TCP | UDP | SupportSoft Nexus Remote Command (control/listening): A proxy gateway connecting remote control traffic[citation needed] | Official |
| 646 | TCP | UDP | LDP, Label Distribution Protocol, a routing protocol used in MPLS networks | Official |
| 647 | TCP | DHCP Failover protocol[22] | Official | |
| 648 | TCP | RRP (Registry Registrar Protocol)[23] | Official | |
| 651 | TCP | UDP | IEEE-MMS[citation needed] | Official |
| 652 | TCP | DTCP, Dynamic Tunnel Configuration Protocol[citation needed] | Unofficial | |
| 653 | TCP | UDP | SupportSoft Nexus Remote Command (data): A proxy gateway connecting remote control traffic[citation needed] | Official |
| 654 | TCP | Media Management System (MMS) Media Management Protocol (MMP)[24] | Official | |
| 657 | TCP | UDP | IBM RMC (Remote monitoring and Control) protocol, used by System p5 AIX Integrated Virtualization Manager (IVM)[25] and Hardware Management Console to connect managed logical partitions (LPAR) to enable dynamic partition reconfiguration | Official |
| 660 | TCP | Mac OS X Server administration | Official | |
| 665 | TCP | sun-dr, Remote Dynamic Reconfiguration[citation needed] | Unofficial | |
| 666 | UDP | Doom, first online first-person shooter | Official | |
| 674 | TCP | ACAP (Application Configuration Access Protocol) | Official | |
| 691 | TCP | MS Exchange Routing | Official | |
| 692 | TCP | Hyperwave-ISP[citation needed] | Official | |
| 694 | TCP | UDP | Linux-HA High availability Heartbeat | Official |
| 695 | TCP | IEEE-MMS-SSL (IEEE Media Management System over SSL)[26] | Official | |
| 698 | UDP | OLSR (Optimized Link State Routing) | Official | |
| 699 | TCP | Access Network[citation needed] | Official | |
| 700 | TCP | EPP (Extensible Provisioning Protocol), a protocol for communication between domain name registries and registrars (RFC 5734) | Official | |
| 701 | TCP | LMP (Link Management Protocol (Internet)),[27] a protocol that runs between a pair of nodes and is used to manage traffic engineering (TE) links | Official | |
| 702 | TCP | IRIS[28][29] (Internet Registry Information Service) over BEEP (Blocks Extensible Exchange Protocol)[30] (RFC 3983) | Official | |
| 706 | TCP | Secure Internet Live Conferencing (SILC) | Official | |
| 711 | TCP | Cisco Tag Distribution Protocol[31][32][33]—being replaced by the MPLS Label Distribution Protocol[34] | Official | |
| 712 | TCP | Topology Broadcast based on Reverse-Path Forwarding routing protocol (TBRPF) (RFC 3684) | Official | |
| 712 | UDP | Promise RAID Controller[citation needed] | Unofficial | |
| 720 | TCP | SMQP, Simple Message Queue Protocol[citation needed] | Unofficial | |
| 749 | TCP | UDP | Kerberos (protocol) administration | Official |
| 750 | TCP | rfile[citation needed] | Official | |
| 750 | UDP | loadav[citation needed] | Official | |
| 750 | UDP | kerberos-iv, Kerberos version IV | Official | |
| 751 | TCP | UDP | kerberos_master, Kerberos authentication | Unofficial |
| 751 | TCP | UDP | pump[citation needed] | Official |
| 752 | UDP | passwd_server, Kerberos Password (kpasswd) server | Unofficial | |
| 752 | TCP | qrh[citation needed] | Official | |
| 752 | UDP | qrh[citation needed] | Official | |
| 753 | UDP | userreg_server, Kerberos userreg server | Unofficial | |
| 753 | TCP | Reverse Routing Header (rrh)[35] | Official | |
| 753 | UDP | Reverse Routing Header (rrh) | Official | |
| 754 | UDP | tell send[citation needed] | Official | |
| 754 | TCP | krb5_prop, Kerberos v5 slave propagation | Unofficial | |
| 754 | TCP | tell send[citation needed] | Official | |
| 760 | TCP | UDP | ns[citation needed] | Official |
| 760 | TCP | UDP | krbupdate [kreg], Kerberos registration | Unofficial |
| 782 | TCP | Conserver serial-console management server | Unofficial | |
| 783 | TCP | SpamAssassin spamd daemon | Unofficial | |
| 808 | TCP | Microsoft Net.TCP Port Sharing Service[citation needed] | Official | |
| 829 | TCP | CMP (Certificate Management Protocol)[citation needed] | Unofficial | |
| 843 | TCP | Adobe Flash[36] | Unofficial | |
| 847 | TCP | DHCP Failover protocol | Official | |
| 848 | TCP | UDP | Group Domain Of Interpretation (GDOI) protocol[citation needed] | Official |
| 860 | TCP | iSCSI (RFC 3720) | Official | |
| 873 | TCP | rsync file synchronisation protocol | Official USA only | |
| 888 | TCP | cddbp, CD DataBase (CDDB) protocol (CDDBP)—unassigned but widespread use | Unofficial | |
| 901 | UDP | VMware Virtual Infrastructure Client (UDP from server being managed to management console) | Unofficial | |
| 901 | TCP | Samba Web Administration Tool (SWAT) | Unofficial | |
| 901 | TCP | VMware Virtual Infrastructure Client (UDP from server being managed to management console) | Unofficial | |
| 902 | TCP | VMware Server Console (TCP from management console to server being Managed) | Unofficial | |
| 902 | UDP | ideafarm-door[citation needed] | Official | |
| 902 | UDP | VMware Server Console (UDP from server being managed to management console) | Unofficial | |
| 902 | TCP | ideafarm-door[citation needed] | Official | |
| 903 | TCP | VMware Remote Console [37] | Unofficial | |
| 904 | TCP | VMware Server Alternate (if 902 is in use, i.e. SUSE linux) | Unofficial | |
| 911 | TCP | Network Console on Acid (NCA)—local tty redirection over OpenSSH | Unofficial | |
| 944 | UDP | Network File System (protocol) Service | Unofficial | |
| 953 | TCP | UDP | Domain Name System (DNS) RNDC Service | Unofficial |
| 973 | UDP | Network File System (protocol) over IPv6 Service | Unofficial | |
| 981 | TCP | SofaWare Technologies Remote HTTPS management for firewall devices running embedded Check Point FireWall-1 software | Unofficial | |
| 987 | TCP | Microsoft This Secure Hypertext Transfer Protocol (HTTPS) port makes Windows SharePoint Services viewable through Remote Web Workplace[citation needed] | Unofficial | |
| 989 | TCP | UDP | FTPS Protocol (data): FTP over TLS/SSL | Official |
| 990 | TCP | UDP | FTPS Protocol (control): FTP over TLS/SSL | Official |
| 991 | TCP | UDP | NAS (Netnews Administration System)[38] | Official |
| 992 | TCP | UDP | TELNET protocol over TLS/SSL | Official |
| 993 | TCP | Internet Message Access Protocol over SSL (IMAPS) | Official | |
| 995 | TCP | Post Office Protocol 3 over TLS/SSL (POP3S) | Official | |
| 999 | TCP | ScimoreDB Database System[citation needed] | Unofficial | |
| 1002 | TCP | Opsware agent (aka cogbot)[citation needed] | Unofficial | |
| 1023 | TCP | UDP | Reserved[1] | Official |
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