It’s a very outdated and very much better approach that remembering meaningless numbers. It sad that the files provided by IANA have ossified over 20 years ago. But they kind of sucked at naming ports/protocols consistently anyway, that’s why I maintain my own list:
environment.etc.services = lib.mkForce {
source = ./path/to/my/services;
};
ftp 21/tcp # File Transfer Protocol (FTP)
tftp 69/udp # Trivial File Transfer protocol (TFTP)
ftps-data 989/tcp # FTP over TLS, data channel
ftps-control 990/tcp # FTP over TLS, control channel
ssh 22/tcp # Secure Shell (SSH)
telnet 23/tcp # Telnet
telnets 992/tcp # Telnet over TLS
smtp 25/tcp # Simple Mail Transfer protocol (SMTP) submission
bgp 179/tcp # Border Gateway Protocol (BGP)
irc 194/tcp # Internet Relay Chat (IRC)
irc 6667/tcp # IRC, alternative port
ircs 6697/tcp # IRC over TLS
rtsp 554/tcp # Real Time Streaming Protocol (RTSP)
rtsp 554/udp # Real Time Streaming Protocol (RTSP)
dns 53/tcp # Domain Name System (DNS) Server
dns 53/udp # Domain Name System (DNS) Server
dot 853/tcp # DNS over TLS (DoT)
doq 853/udp # DNS over QUIC (DoQ)
mdns 5353/udp # Multicast DNS
dnscrypt 443/udp # DNSCrypt
dhcpv4-server 67/udp # Dynamic Host Configuration Protocol (DHCP), IPv4 server
dhcpv4-client 68/udp # Dynamic Host Configuration Protocol (DHCP), IPv4 client
dhcpv6-client 546/udp # Dynamic Host Configuration Protocol (DHCP), IPv6 server
dhcpv6-server 547/udp # Dynamic Host Configuration Protocol (DHCP), IPv6 client
http 80/tcp # HyperText Transfer Protocol (HTTP)
https 443/tcp # HTTP over TLS
http-alt 8080/tcp # HTTP, alternative port
https-alt 8443/tcp # HTTP over TLS, alternative port
gopher 70/tcp # Gopher
gemini 1965/tcp # Gemini
traceroute 33434/tcp # TCP traceroute
traceroute 33434/udp # UDP traceroute
whois 43/tcp # WHOIS server
nicname 43/tcp # WHOIS server (needed by whois command)
kerberos 88/tcp # Kerberos, ticket service
kerberos 88/udp # Kerberos, ticket service
kerberos-admin 749/tcp # Kerberos, administration/password change service
nfs 2049/tcp # Network File System (NFS)
nfs 2049/udp # Network File System (NFS)
ntp 123/udp # Network Time Protocol (NTP)
chrony 323/udp # Chrony command interface
mpd 6600/tcp # Music Player Daemon
plan9-fs 564/tcp # Plan 9, file service (9pfs)
plan9-auth 567/tcp # Plan 9, auth service
plan9-cpu 17010/tcp # Plan 9, cpu service
plan9-import 17007/tcp # Plan 9, import
plan9-secstore 5356/tcp # Plan 9, secstore
pop3 110/tcp # Post Office Protocol version 3 (POP3)
pop3s 995/tcp # POP3 over TLS
imap 143/tcp # Internet Message Access Protocol (IMAP)
imaps 993/tcp # IMAP over TLS
netbios-name 137/tcp # NETBIOS, name service
netbios-name 137/udp # NETBIOS, name service
netbios-data 138/tcp # NETBIOS, datagram service
netbios-data 138/udp # NETBIOS, datagram service
netbios-session 139/tcp # NETBIOS, session service
netbios-session 139/udp # NETBIOS, session service
smb 445/tcp # Server Message Block (SMB)
llmnr 5355/tcp # Link-Local Multicast Name Resolution (LLMNR)
llmnr 5355/udp # Link-Local Multicast Name Resolution (LLMNR)
hyperv-rdp 2179/tcp # Hyper-V Remote Desktop Protocol (RDP)
hyperv-rdp 2179/udp # Hyper-V Remote Desktop Protocol (RDP)
anydesk 6568/tcp # AnyDesk remote desktop
teamviewer 5938/tcp # TeamViewer remote desktop
teamviewer 5938/udp # TeamViewer remote desktop
doom 666/tcp # DOOM, id Software
doom 666/udp # DOOM, id Software
quake 26000/tcp # Quake, id Software
quake 26000/udp # Quake, id Software
quake2 27910/udp # Quake II, id Software
quake3 27960/udp # Quake III Arena, id Software
warzone2100 2100/tcp # Warzone 2100
freeciv 5556/tcp # Freeciv
terraria 7777/tcp # Terraria
starbound 21025/tcp # starbound
minecraft 25565/tcp # Minecraft
minetest 30000/tcp # Minetest
openarena 27960/udp # OpenArena
bnet-game 1119/tcp # Battle.net, game
bnet-game 1119/udp # Battle.net, game
bnet-file 1120/tcp # Battle.net, file transfer
bnet-file 1120/udp # Battle.net, file transfer
warcraft 3724/tcp # World of Warcraft, Blizzard
warcraft 3724/udp # World of Warcraft, Blizzard
xbox 3074/tcp # Xbox game port
xbox 3074/udp # Xbox game port
quake-world 27500/udp # Quake world
gog-multiplayer 5687/udp # GOG multiplayer game protocol
tinc 635/tcp # Tinc VPN
openvpn 1194/udp # OpenVPN
ipsec-nat 4500/tcp # IPsec NAT-Traversal
ipsec-nat 4500/udp # IPsec NAT-Traversal
radius 1812/udp # RADIUS
radius-account 1813/udp # RADIUS, accounting
radius-dynauth 3799/tcp # RADIUS, dynamic authorization
radius-dynauth 3799/udp # RADIUS, dynamic authorization
gnunet 2086/tcp # GNUnet
gnunet 2086/udp # GNUnet
stun 3478/tcp # Session Traversal Utilities for NAT (STUN)
stun 3478/udp # Session Traversal Utilities for NAT (STUN)
turn 3478/tcp # Traversal Using Relays around NAT (TURN)
turn 3478/udp # Traversal Using Relays around NAT (TURN)
stuns 5349/udp # STUN over DTLS
turns 5349/tcp # TURN over TLS
turns 5349/udp # TURN over DTLS
teredo 3544/udp # Teredo Port
apcupsd 3551/tcp # Apcupsd Information Port
svn 3690/tcp # Subversion
netboot-pxe 3928/tcp # PXE NetBoot Manager
netboot-pxe 3928/udp # PXE NetBoot Manager
gre-in-udp 4754/udp # GRE-in-UDP Encapsulation
gre-udp-dtls 4755/udp # GRE-in-UDP Encapsulation with DTLS
sip 5060/tcp # SIP
sip-tls 5061/tcp # SIP over TLS
sip-directory 5059/tcp # SIP Directory Services
xmpp-client 5222/tcp # Extensible Messaging and Presence Protocol (XMPP), client
xmpp-client-tls 5223/tcp # Extensible Messaging and Presence Protocol (XMPP), client over TLS
xmpp-server 5269/tcp # Extensible Messaging and Presence Protocol (XMPP), server
pcp 5351/udp # Port Control Protocol (PCP)
pcp-multicast 5350/udp # Port Control Protocol (PCP), Multicast notifications
upnp 1900/udp # Universal Plug and Play (UPnP)
zmq-file 5670/tcp # ZeroMQ, file publish-subscribe
zmq-disc 5670/udp # ZeroMQ, Local area discovery and messaging
x11 6000/tcp # X Window System
x11-font 7100/tcp # X Font Service
privoxy 8118/tcp # Privoxy web proxy
polipo 8123/tcp # Polipo caching web proxy
squid 3128/tcp # Squid proxy
squid-snmp 3401/udp # Squid proxy, SNMP port
squid-ipc 3130/udp # Squid proxy, IPC port
squid-htcp 4827/udp # Squid proxy, HTCP port
raw-print 9100/tcp # Raw printing (JetDirect, PDL, etc.)
ipp 631/tcp # Internet Printing Protocol (IPP)
ipps 631/tcp # IPP over HTTPS
webdav 9800/tcp # WebDAV
webdav 9802/tcp # WebDAV over TLS
zabbix-agent 10050/tcp # Zabbix Agent
zabbix-agent 10050/udp # Zabbix Agent
zabbix-trapper 10051/tcp # Zabbix Trapper
zabbix-trapper 10051/udp # Zabbix Trapper
rsync 873/tcp # rsync server
plex 32400/tcp # Plex media server
bittorrent 51413/tcp # Bittorrent, TCP
bittorrent-utp 51413/udp # Bittorrent, μTP
bittorrent-track 6881/tcp # BitTorrent tracker
gnutella 6346/tcp # Gnutella
gnutella 6346/udp # Gnutella
dropbox 17500/tcp # Dropbox LanSync, protocol
dropbox-disc 17500/udp # Dropbox LanSync, discovery
gdrive-sync 37483/tcp # Google Drive Sync
syncthing 22000/tcp # Syncthing, transfer
syncthing 22000/udp # Syncthing, transfer
syncthing-relay 22067/tcp # Syncthing, relay
syncthing-disc 21027/udp # Syncthing, discovery
syncthing-ui 8384/tcp # Syncthing, Web UI
bitcoin-rpc 8332/tcp # Bitcoin, RPC
bitcoin 8333/tcp # Bitcoin, network
monero 18080/tcp # Monero, network
monero-rpc 18081/tcp # Monero, RPC
tor 9001/tcp # Tor
tor-directory 9030/tcp # Tor, directory port
tor-transparent 9040/tcp # Tor, transparent proxy port
tor-socks 9050/tcp # Tor, generic SOCKS port
tor-browser 9050/tcp # Tor, browser SOCKS port
tor-control 9051/tcp # Tor, control port
zigbee-ip 17755/tcp # ZigBee IP Transport Service
zigbee-ip 17755/udp # ZigBee IP Transport Service
zigbee-ips 17756/tcp # ZigBee IP Transport Secure Service
zigbee-ips 17756/udp # ZigBee IP Transport Secure Service
z-wave-s 41230/tcp # Z-Wave Protocol over TLS
z-wave-s 41230/udp # Z-Wave Protocol over DTLS
cockroachdb 26257/tcp # CockroachDB database
mongodb 27017/tcp # MongoDB database
couchdb 5984/tcp # CouchDB database
postgresql 5432/tcp # PostgreSQL database
mysql-classic 3306/tcp # MySQL database, classic protocol
mysql-extended 33060/tcp # MySQL database, extended protocol
mysql-router 6446/tcp # MySQL router, classic protocol
mysql-router 6449/tcp # MySQL router, extended protocol
redis 6379/tcp # Redis key-value data store
Now open iftop -P
and enjoy your superpowers.