HTTPfy

Port 4681 (parliant)

IANA assigns port 4681 to parliant: Parliant Telephony System.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
parliant TCP Parliant Telephony System Colin Henein -
parliant UDP Parliant Telephony System Colin Henein -

Registry dates for this port: registered 2005-08.

Check what is listening on port 4681

Linux: is anything listening on TCP 4681?
sudo ss -tlnp 'sport = :4681'
Linux: UDP 4681
sudo ss -ulnp 'sport = :4681'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4681
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4681 '
Windows (Command Prompt)
netstat -ano | findstr :4681
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4681 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4681
From Windows
Test-NetConnection HOST -Port 4681
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4681

Block port 4681 in the firewall

ufw
sudo ufw deny 4681/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4681 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4681 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4681' -Direction Inbound -Protocol TCP -LocalPort 4681 -Action Block
ufw
sudo ufw deny 4681/udp
iptables
sudo iptables -A INPUT -p udp --dport 4681 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4681 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4681' -Direction Inbound -Protocol UDP -LocalPort 4681 -Action Block

Related ports

4679mgesupervision4680mgemanagement4682finisar4683spike

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