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Port 697 (uuidgen)

IANA assigns port 697 to uuidgen: UUIDGEN.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
uuidgen TCP UUIDGEN James Falkner -
uuidgen UDP UUIDGEN James Falkner -

Check what is listening on port 697

Linux: is anything listening on TCP 697?
sudo ss -tlnp 'sport = :697'
Linux: UDP 697
sudo ss -ulnp 'sport = :697'
Linux / macOS: which process owns the port
sudo lsof -nP -i :697
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':697 '
Windows (Command Prompt)
netstat -ano | findstr :697
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 697 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 697
From Windows
Test-NetConnection HOST -Port 697
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 697

Block port 697 in the firewall

ufw
sudo ufw deny 697/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 697 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 697 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 697' -Direction Inbound -Protocol TCP -LocalPort 697 -Action Block
ufw
sudo ufw deny 697/udp
iptables
sudo iptables -A INPUT -p udp --dport 697 -j DROP
nftables
sudo nft add rule inet filter input udp dport 697 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 697' -Direction Inbound -Protocol UDP -LocalPort 697 -Action Block

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