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Port 1222 (nerv)

IANA assigns port 1222 to nerv: SNI R&D network.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nerv TCP SNI R&D network Martin Freiss -
nerv UDP SNI R&D network Martin Freiss -

Check what is listening on port 1222

Linux: is anything listening on TCP 1222?
sudo ss -tlnp 'sport = :1222'
Linux: UDP 1222
sudo ss -ulnp 'sport = :1222'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1222
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1222 '
Windows (Command Prompt)
netstat -ano | findstr :1222
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1222 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1222
From Windows
Test-NetConnection HOST -Port 1222
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1222

Block port 1222 in the firewall

ufw
sudo ufw deny 1222/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1222 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1222 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1222' -Direction Inbound -Protocol TCP -LocalPort 1222 -Action Block
ufw
sudo ufw deny 1222/udp
iptables
sudo iptables -A INPUT -p udp --dport 1222 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1222 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1222' -Direction Inbound -Protocol UDP -LocalPort 1222 -Action Block

Related ports

1220qt-serveradmin1221sweetware-apps1223tgp1224vpnz

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