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Port 5912 (ais-met, fis)

IANA assigns port 5912 to ais-met, fis: Aeronautical Information Service/Meteorological applications using ACARS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ais-met TCP Aeronautical Information Service/Meteorological applications using ACARS Eivan Cerasi -
ais-met UDP Aeronautical Information Service/Meteorological applications using ACARS Eivan Cerasi -
fis SCTP Flight Information Services Justin Yu -

Registry dates for this port: registered 2008-10-10, last modified 2022-08-08.

Check what is listening on port 5912

Linux: is anything listening on TCP 5912?
sudo ss -tlnp 'sport = :5912'
Linux: UDP 5912
sudo ss -ulnp 'sport = :5912'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5912
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5912 '
Windows (Command Prompt)
netstat -ano | findstr :5912
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5912 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5912
From Windows
Test-NetConnection HOST -Port 5912
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5912

Block port 5912 in the firewall

ufw
sudo ufw deny 5912/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5912 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5912 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5912' -Direction Inbound -Protocol TCP -LocalPort 5912 -Action Block
ufw
sudo ufw deny 5912/udp
iptables
sudo iptables -A INPUT -p udp --dport 5912 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5912 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5912' -Direction Inbound -Protocol UDP -LocalPort 5912 -Action Block

Related ports

5910ats-atn, cm5911ats-acars, cpdlc5913aoc-acars, ads-c5914ipsdtls

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.