HTTPfy

Port 682 (xfr)

IANA assigns port 682 to xfr: XFR.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
xfr TCP XFR Noah Paul 2 -
xfr UDP XFR Noah Paul 2 -

Check what is listening on port 682

Linux: is anything listening on TCP 682?
sudo ss -tlnp 'sport = :682'
Linux: UDP 682
sudo ss -ulnp 'sport = :682'
Linux / macOS: which process owns the port
sudo lsof -nP -i :682
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':682 '
Windows (Command Prompt)
netstat -ano | findstr :682
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 682 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 682
From Windows
Test-NetConnection HOST -Port 682
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 682

Block port 682 in the firewall

ufw
sudo ufw deny 682/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 682 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 682 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 682' -Direction Inbound -Protocol TCP -LocalPort 682 -Action Block
ufw
sudo ufw deny 682/udp
iptables
sudo iptables -A INPUT -p udp --dport 682 -j DROP
nftables
sudo nft add rule inet filter input udp dport 682 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 682' -Direction Inbound -Protocol UDP -LocalPort 682 -Action Block

Related ports

680entrust-aaas681entrust-aams683corba-iiop684corba-iiop-ssl

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