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Port 2557 (nicetec-mgmt)

IANA assigns port 2557 to nicetec-mgmt.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nicetec-mgmt TCP nicetec-mgmt Joerg Paulus -
nicetec-mgmt UDP nicetec-mgmt Joerg Paulus -

Check what is listening on port 2557

Linux: is anything listening on TCP 2557?
sudo ss -tlnp 'sport = :2557'
Linux: UDP 2557
sudo ss -ulnp 'sport = :2557'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2557
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2557 '
Windows (Command Prompt)
netstat -ano | findstr :2557
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2557 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2557
From Windows
Test-NetConnection HOST -Port 2557
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2557

Block port 2557 in the firewall

ufw
sudo ufw deny 2557/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2557 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2557 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2557' -Direction Inbound -Protocol TCP -LocalPort 2557 -Action Block
ufw
sudo ufw deny 2557/udp
iptables
sudo iptables -A INPUT -p udp --dport 2557 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2557 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2557' -Direction Inbound -Protocol UDP -LocalPort 2557 -Action Block

Related ports

2555compaq-wcp2556nicetec-nmsvc2558pclemultimedia2559lstp

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