HTTPfy

Port 2126 (pktcable-cops)

IANA assigns port 2126 to pktcable-cops: PktCable-COPS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pktcable-cops TCP PktCable-COPS Glenn Russell -
pktcable-cops UDP PktCable-COPS Glenn Russell -

Check what is listening on port 2126

Linux: is anything listening on TCP 2126?
sudo ss -tlnp 'sport = :2126'
Linux: UDP 2126
sudo ss -ulnp 'sport = :2126'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2126
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2126 '
Windows (Command Prompt)
netstat -ano | findstr :2126
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2126 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2126
From Windows
Test-NetConnection HOST -Port 2126
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2126

Block port 2126 in the firewall

ufw
sudo ufw deny 2126/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2126 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2126 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2126' -Direction Inbound -Protocol TCP -LocalPort 2126 -Action Block
ufw
sudo ufw deny 2126/udp
iptables
sudo iptables -A INPUT -p udp --dport 2126 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2126 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2126' -Direction Inbound -Protocol UDP -LocalPort 2126 -Action Block

Related ports

2124elatelink2125lockstep2127index-pc-wb2128net-steward

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