Online Services Reference
Everyday TCP/IP ports you should know
A concise guide for administrators and dev teams who manage firewalls, proxies or SaaS infrastructure. These ports surface across mail, web, directory and streaming services.
Ports are the direct lines that let protocols talk to the world. While modern routers can enforce policies, you still need to understand which services open which ports to keep traffic predictable and secure. Scroll through the highlights or jump down to the detailed table for every port we monitor on our managed hosting fleet.
Port categories
Web & API traffic
HTTP and HTTPS remain the backbone of SaaS. Add proxy ports when you run internal gateways.
- 80 / 443 - Standard web and API defaults
- 8080 / 8443 - Alternative ports for staging or app gateways
- 7070 / 7071 - Streaming control channels (Realplayer)
Mail & messaging
Inbound/outbound protocols still use dedicated ports even as TLS becomes standard.
- 25 / 465 / 587 - SMTP, secure submission, MTA relays
- 110 / 995 - POP3 and POP3S for legacy clients
- 143 / 993 - IMAP and IMAPS for mailbox synchronization
Files & remote access
Secure file transfers and shell access rely on long-standing port assignments.
- 20 / 21 - FTP data and control (rare now, but still supported)
- 22 - SSH for shells and SCP/SFTP
- 119 / 389 / 636 - NNTP and directory services
Directory & streaming services
Authentication and media control keep infrastructure orchestration running.
- 445 / 139 / 137 / 138 - SMB and NetBIOS for legacy Windows services
- 5060 / 5061 - SIP control for VoIP
- 3112 / 3185 / 4000 - Monitoring tunnels and media sharing (KDE, SuSE, ICQ)
Highlight reference cards
Browser & API endpoints
80 · 443 · 8080
These ports carry the bulk of HTTP/S sessions and are the first to allow HTTPS termination.
- Port 80 for legacy redirects
- Port 443 for TLS-encrypted traffic
- Port 8080 when reverse proxies manage internal APIs
Authentication & directory
53 · 389 · 636
DNS and LDAP remain critical for name resolution and identity lookups.
- 53 handles DNS lookups for all services
- 389 for unencrypted LDAP queries
- 636 for LDAPS and secure binds
Streaming & collaboration
5060 · 1755 · 7070
Voice, streaming and media coordination still follow known TCP/UDP ports.
- SIP uses 5060/5061 for VoIP signaling
- 1755 for Windows media services
- 7070/7071 for RealPlayer control
Detailed list of known TCP/IP ports
Keep this list handy when mapping firewall rules, proxies or hosted services.
| Port | Service | Protocol | Description |
|---|---|---|---|
| 20 | ftp-data | TCP/UDP | File Transfer Data |
| 21 | ftp | TCP/UDP | File Transfer Control |
| 22 | ssh | TCP | SSH Remote Login Protocol |
| 23 | telnet | TCP | Telnet |
| 25 | smtp | TCP | Simpler Mail Transfer Protocol |
| 53 | domain | TCP/UDP | Domain Name Server |
| 80 | http | TCP | Hypertext Transfer Protocol |
| 102 | iso-tsap | TCP/UDP | X.400, ISO-TSAP Class 0 |
| 110 | pop3 | TCP | Post Office Protocol 3 |
| 119 | nntp | TCP | Network News Transfer Protocol |
| 135 | loc-srv/epmap | TCP/UDP | MS DCE RPC end-point mapper |
| 137 | netbios-ns | TCP/UDP | NetBIOS Name Service |
| 138 | netbios-dgm | TCP/UDP | NetBIOS Datagram Service |
| 139 | netbios-ssn | TCP/UDP | NetBIOS Session Service |
| 143 | imap4 | TCP | Internet Message Access Protocol 4 |
| 389 | ldap | TCP | Lightweight Directory Access Protocol |
| 443 | ssl | TCP | Hypertext Transfer Protocol over TLS/SSL |
| 445 | microsoft-ds | TCP/UDP | Windows 2000/XP SMB |
| 554 | rtsp | TCP | Real Time Stream Control Protocol |
| 636 | sldap | TCP | LDAP over SSL |
| 993 | imaps | TCP | IMAP over TLS/SSL |
| 995 | pop3s | TCP | POP3 over TLS/SSL |
| 1214 | kazaa | TCP | Kazaa / Morpheus |
| 1433 | ms-sql-s | TCP/UDP | Microsoft SQL Server |
| 1434 | ms-sql-m | UDP | Microsoft SQL Monitor |
| 1755 | ms-streaming | TCP/UDP | Microsoft Media Player |
| 1863 | msnp | TCP | Microsoft MSN Messenger |
| 3112 | ksysguard | TCP/UDP | KDE System Guard |
| 3185 | smpppd | TCP/UDP | SuSE Meta PPPD |
| 4000 | icq | TCP/UDP | ICQ/Terabase |
| 4661 | - | TCP | eDonkey |
| 4662 | - | TCP | eDonkey |
| 4665 | - | UDP | eDonkey |
| 5050 | mmc | TCP | Multimedia Conference Control Tool |
| 5060 | sip | TCP/UDP | SIP |
| 5190 | aol | TCP | AOL Instant Messenger / Mirabilis ICQ |
| 6346 | gnutella-svc | TCP | Gnutella |
| 6347 | gnutella-rtr | TCP | Gnutella |
| 7070 | arcp | TCP | Realplayer Server |
| 7071 | arcp | TCP | Realplayer Server |