Here is a list of common and well-known ports and their services with some examples of software that might be running behind them. This is in no means an exhaustive list but it is a good reference. If you see that something is missing that really should be there, let me know @parkado{@}parkado,it
For search please use ctrl+f! I don't see a need to develope a search algorithm if it already exists on all browsers. I will however do my utmost that all of the data on my website is always searchable with ctrl+f (so no javascript dynamic loading BS here).
| Port | Service Name | Transport Protocol | Description | Popular Software |
|---|---|---|---|---|
| 7 | Echo | TCP, UDP | Echo service. | Test utilities (e.g., ping) |
| 19 | CHARGEN | TCP, UDP | Character Generator Protocol, rarely used due to vulnerabilities. | Test utilities |
| 20 | FTP-data | TCP, SCTP | File Transfer Protocol data transfer. | FileZilla, ProFTPD |
| 21 | FTP | TCP, UDP, SCTP | File Transfer Protocol command control. | FileZilla, vsftpd |
| 22 | SSH/SCP/SFTP | TCP, UDP, SCTP | Secure Shell, secure logins, file transfers (scp, sftp), and port forwarding. | OpenSSH, PuTTY |
| 23 | Telnet | TCP | Telnet protocol, for unencrypted text communications. | PuTTY, Telnet Client |
| 25 | SMTP | TCP | Simple Mail Transfer Protocol, used for email routing between mail servers. | Postfix, Sendmail |
| 42 | WINS Replication | TCP, UDP | Microsoft Windows Internet Name Service, vulnerable to attacks on a local network. | Microsoft WINS |
| 43 | WHOIS | TCP, UDP | Whois service, provides domain-level information. | WHOIS Client |
| 49 | TACACS | UDP, (Optional: TCP) | Terminal Access Controller Access-Control System, provides remote authentication and related services for network access. | Cisco ACS |
| 53 | DNS | TCP, UDP | Domain Name System name resolver. | BIND, Unbound, Google DNS |
| 67 | DHCP/BOOTP (Server) | UDP | Dynamic Host Configuration Protocol and its predecessor Bootstrap Protocol Server. | ISC DHCP Server |
| 68 | DHCP/BOOTP (Client) | UDP | Dynamic Host Configuration Protocol and its predecessor Bootstrap Protocol Server. | ISC DHCP Client |
| 69 | TFTP | UDP | Trivial File Transfer Protocol. | tftp-hpa, SolarWinds TFTP |
| 70 | Gopher | TCP | Communication protocol for distributing, searching, and retrieving documents in IP networks. | Gopher servers |
| 79 | Finger | TCP | Name/Finger protocol for retrieving and manipulating user information. | Finger Utilities |
| 80 | HTTP | TCP, UDP, SCTP | Hypertext Transfer Protocol; uses TCP in versions 1.x and 2. HTTP/3 uses QUIC over UDP. | Apache HTTPD, Nginx |
| 88 | Kerberos | TCP, UDP | Network authentication system. | MIT Kerberos, Heimdal |
| 102 | Microsoft Exchange ISO-TSAP | TCP | Microsoft Exchange ISO Transport Service Access Point Class 0 protocol. | Microsoft Exchange Server |
| 110 | POP3 | TCP | Post Office Protocol, version 3 (POP3). | Dovecot, Courier POP3 |
| 113 | Ident | TCP | Identification Protocol, identifies the user of a particular TCP connection. | Ident Daemons |
| 119 | NNTP (Usenet) | TCP | Network News Transfer Protocol. | INN (InterNetNews) |
| 123 | NTP | UDP | Network Time Protocol. | ntpd, Chrony |
| 135 | Microsoft RPC EPMAP | TCP, UDP | Microsoft Remote Procedure Call (RPC) Endpoint Mapper service. | Microsoft RPC Services |
| 137 | NetBIOS Name Service | TCP, UDP | NetBIOS Name Service, used for name registration and resolution. | Samba, Microsoft NetBIOS |
| 138 | NetBIOS Datagram Service | TCP, UDP | NetBIOS Datagram Service, used for providing access to shared resources. | Samba, Microsoft NetBIOS |
| 139 | NetBIOS Session Service | TCP, UDP | NetBIOS Session Service. | Samba, Microsoft NetBIOS |
| 143 | IMAP | TCP, UDP | Internet Message Access Protocol, manages electronic mail messages on a server. | Dovecot, Courier IMAP |
| 161 | SNMP | UDP | Simple Network Management Protocol; agents communicate on this port. | Net-SNMP, Zabbix Agents |
| 162 | SNMP Trap | UDP | SNMP listens for asynchronous traps. | Net-SNMP, Zabbix Agents |
| 179 | BGP | TCP | Border Gateway Protocol used for routing between autonomous systems. | Quagga, BIRD |
| 389 | LDAP | TCP, UDP | Lightweight Directory Access Protocol for directory services. | OpenLDAP, Microsoft Active Directory |
| 443 | HTTPS | TCP, UDP, SCTP | Hypertext Transfer Protocol Secure; uses QUIC over UDP in HTTP/3. | Apache HTTPD, Nginx |
| 445 | Microsoft DS SMB | TCP, UDP | Microsoft Directory Services: TCP for Active Directory, Windows shares; UDP for SMB file sharing. | Samba, Microsoft SMB |
| 465 | SMTPSL | TCP | Authenticated SMTP over TLS/SSL (SMTPS). | Postfix, Exim |
| 500 | IPSec / ISAKMP / IKE | UDP | Internet Protocol Security / Internet Security Association and Key Management Protocol / Internet Key Exchange. | Strongswan, OpenSwan |
| 636 | LDAPS | TCP, UDP | LDAP over SSL/TLS for secure directory services. | OpenLDAP, Microsoft Active Directory |
| 873 | rsync | TCP | Utility for efficient file transfer and synchronization. | rsync |
| 993 | IMAPS | TCP | Internet Message Access Protocol over TLS/SSL. | Dovecot, Courier IMAP |
| 995 | POP3S | TCP | Post Office Protocol 3 over TLS/SSL. | Dovecot, Courier POP3 |
| 2049 | NFS | TCP, UDP | Network File System for distributed file systems. | nfs-utils |
| 3306 | MySQL | TCP | MySQL database service. | MySQL, MariaDB |
| 5432 | PostgreSQL | TCP | PostgreSQL database service. | PostgreSQL |
| 6379 | Redis | TCP | Redis key-value store. | Redis |
| 11211 | Memcached | TCP, UDP | Distributed memory object caching system. | Memcached |