HTTPfy

Port 3918 (pktcablemmcops)

IANA assigns port 3918 to pktcablemmcops: PacketCableMultimediaCOPS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pktcablemmcops TCP PacketCableMultimediaCOPS Eric Rosenfeld -
pktcablemmcops UDP PacketCableMultimediaCOPS Eric Rosenfeld -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3918

Linux: is anything listening on TCP 3918?
sudo ss -tlnp 'sport = :3918'
Linux: UDP 3918
sudo ss -ulnp 'sport = :3918'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3918
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3918 '
Windows (Command Prompt)
netstat -ano | findstr :3918
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3918 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3918
From Windows
Test-NetConnection HOST -Port 3918
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3918

Block port 3918 in the firewall

ufw
sudo ufw deny 3918/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3918 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3918 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3918' -Direction Inbound -Protocol TCP -LocalPort 3918 -Action Block
ufw
sudo ufw deny 3918/udp
iptables
sudo iptables -A INPUT -p udp --dport 3918 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3918 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3918' -Direction Inbound -Protocol UDP -LocalPort 3918 -Action Block

Related ports

3916wysdmc3917aftmux3919hyperip3920exasoftport1

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