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Port 492 (ticf-1)

IANA assigns port 492 to ticf-1: Transport Independent Convergence for FNA.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ticf-1 TCP Transport Independent Convergence for FNA - -
ticf-1 UDP Transport Independent Convergence for FNA - -

Check what is listening on port 492

Linux: is anything listening on TCP 492?
sudo ss -tlnp 'sport = :492'
Linux: UDP 492
sudo ss -ulnp 'sport = :492'
Linux / macOS: which process owns the port
sudo lsof -nP -i :492
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':492 '
Windows (Command Prompt)
netstat -ano | findstr :492
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 492 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 492
From Windows
Test-NetConnection HOST -Port 492
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 492

Block port 492 in the firewall

ufw
sudo ufw deny 492/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 492 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 492 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 492' -Direction Inbound -Protocol TCP -LocalPort 492 -Action Block
ufw
sudo ufw deny 492/udp
iptables
sudo iptables -A INPUT -p udp --dport 492 -j DROP
nftables
sudo nft add rule inet filter input udp dport 492 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 492' -Direction Inbound -Protocol UDP -LocalPort 492 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.