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Port 122 (smakynet)

IANA assigns port 122 to smakynet: SMAKYNET.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
smakynet TCP SMAKYNET Pierre Arnaud -
smakynet UDP SMAKYNET Pierre Arnaud -

Check what is listening on port 122

Linux: is anything listening on TCP 122?
sudo ss -tlnp 'sport = :122'
Linux: UDP 122
sudo ss -ulnp 'sport = :122'
Linux / macOS: which process owns the port
sudo lsof -nP -i :122
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':122 '
Windows (Command Prompt)
netstat -ano | findstr :122
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 122 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 122
From Windows
Test-NetConnection HOST -Port 122
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 122

Block port 122 in the firewall

ufw
sudo ufw deny 122/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 122 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 122 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 122' -Direction Inbound -Protocol TCP -LocalPort 122 -Action Block
ufw
sudo ufw deny 122/udp
iptables
sudo iptables -A INPUT -p udp --dport 122 -j DROP
nftables
sudo nft add rule inet filter input udp dport 122 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 122' -Direction Inbound -Protocol UDP -LocalPort 122 -Action Block

Related ports

120cfdptkt121erpc123NTP124ansatrader

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