HTTPfy

Port 4941 (eq-office-4941)

IANA assigns port 4941 to eq-office-4941: Equitrac Office.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
eq-office-4941 TCP Equitrac Office - -
eq-office-4941 UDP Equitrac Office - -

Check what is listening on port 4941

Linux: is anything listening on TCP 4941?
sudo ss -tlnp 'sport = :4941'
Linux: UDP 4941
sudo ss -ulnp 'sport = :4941'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4941
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4941 '
Windows (Command Prompt)
netstat -ano | findstr :4941
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4941 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4941
From Windows
Test-NetConnection HOST -Port 4941
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4941

Block port 4941 in the firewall

ufw
sudo ufw deny 4941/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4941 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4941 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4941' -Direction Inbound -Protocol TCP -LocalPort 4941 -Action Block
ufw
sudo ufw deny 4941/udp
iptables
sudo iptables -A INPUT -p udp --dport 4941 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4941 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4941' -Direction Inbound -Protocol UDP -LocalPort 4941 -Action Block

Related ports

4937atsc-mh-ssc4940eq-office-49404942eq-office-49424949munin

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