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Port 2556 (nicetec-nmsvc)

IANA assigns port 2556 to nicetec-nmsvc.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nicetec-nmsvc TCP nicetec-nmsvc - -
nicetec-nmsvc UDP nicetec-nmsvc - -

Check what is listening on port 2556

Linux: is anything listening on TCP 2556?
sudo ss -tlnp 'sport = :2556'
Linux: UDP 2556
sudo ss -ulnp 'sport = :2556'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2556
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2556 '
Windows (Command Prompt)
netstat -ano | findstr :2556
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2556 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2556
From Windows
Test-NetConnection HOST -Port 2556
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2556

Block port 2556 in the firewall

ufw
sudo ufw deny 2556/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2556 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2556 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2556' -Direction Inbound -Protocol TCP -LocalPort 2556 -Action Block
ufw
sudo ufw deny 2556/udp
iptables
sudo iptables -A INPUT -p udp --dport 2556 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2556 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2556' -Direction Inbound -Protocol UDP -LocalPort 2556 -Action Block

Related ports

2554vcnet-link-v102555compaq-wcp2557nicetec-mgmt2558pclemultimedia

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