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Port 767 (phonebook)

IANA assigns port 767 to phonebook: phone.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
phonebook TCP phone Josyula R Rao -
phonebook UDP phone Josyula R Rao -

Check what is listening on port 767

Linux: is anything listening on TCP 767?
sudo ss -tlnp 'sport = :767'
Linux: UDP 767
sudo ss -ulnp 'sport = :767'
Linux / macOS: which process owns the port
sudo lsof -nP -i :767
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':767 '
Windows (Command Prompt)
netstat -ano | findstr :767
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 767 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 767
From Windows
Test-NetConnection HOST -Port 767
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 767

Block port 767 in the firewall

ufw
sudo ufw deny 767/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 767 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 767 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 767' -Direction Inbound -Protocol TCP -LocalPort 767 -Action Block
ufw
sudo ufw deny 767/udp
iptables
sudo iptables -A INPUT -p udp --dport 767 -j DROP
nftables
sudo nft add rule inet filter input udp dport 767 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 767' -Direction Inbound -Protocol UDP -LocalPort 767 -Action Block

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