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Port 680 (entrust-aaas)

IANA assigns port 680 to entrust-aaas.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
entrust-aaas TCP entrust-aaas - -
entrust-aaas UDP entrust-aaas - -

Check what is listening on port 680

Linux: is anything listening on TCP 680?
sudo ss -tlnp 'sport = :680'
Linux: UDP 680
sudo ss -ulnp 'sport = :680'
Linux / macOS: which process owns the port
sudo lsof -nP -i :680
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':680 '
Windows (Command Prompt)
netstat -ano | findstr :680
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 680 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 680
From Windows
Test-NetConnection HOST -Port 680
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 680

Block port 680 in the firewall

ufw
sudo ufw deny 680/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 680 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 680 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 680' -Direction Inbound -Protocol TCP -LocalPort 680 -Action Block
ufw
sudo ufw deny 680/udp
iptables
sudo iptables -A INPUT -p udp --dport 680 -j DROP
nftables
sudo nft add rule inet filter input udp dport 680 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 680' -Direction Inbound -Protocol UDP -LocalPort 680 -Action Block

Related ports

678ggf-ncp679mrm681entrust-aams682xfr

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