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Port 212 (anet)

IANA assigns port 212 to anet: ATEXSSTR.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
anet TCP ATEXSSTR Jim Taylor -
anet UDP ATEXSSTR Jim Taylor -

Check what is listening on port 212

Linux: is anything listening on TCP 212?
sudo ss -tlnp 'sport = :212'
Linux: UDP 212
sudo ss -ulnp 'sport = :212'
Linux / macOS: which process owns the port
sudo lsof -nP -i :212
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':212 '
Windows (Command Prompt)
netstat -ano | findstr :212
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 212 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 212
From Windows
Test-NetConnection HOST -Port 212
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 212

Block port 212 in the firewall

ufw
sudo ufw deny 212/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 212 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 212 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 212' -Direction Inbound -Protocol TCP -LocalPort 212 -Action Block
ufw
sudo ufw deny 212/udp
iptables
sudo iptables -A INPUT -p udp --dport 212 -j DROP
nftables
sudo nft add rule inet filter input udp dport 212 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 212' -Direction Inbound -Protocol UDP -LocalPort 212 -Action Block

Related ports

210z39-50, z39.50211914c-g, 914c/g213ipx214vmpwscs

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