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Port 7549 (nls-tl)

IANA assigns port 7549 to nls-tl: Network Layer Signaling Transport Layer.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
nls-tl TCP Network Layer Signaling Transport Layer Melinda Shore -
nls-tl UDP Network Layer Signaling Transport Layer Melinda Shore -

Registry dates for this port: registered 2006-05.

Check what is listening on port 7549

Linux: is anything listening on TCP 7549?
sudo ss -tlnp 'sport = :7549'
Linux: UDP 7549
sudo ss -ulnp 'sport = :7549'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7549
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7549 '
Windows (Command Prompt)
netstat -ano | findstr :7549
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7549 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7549
From Windows
Test-NetConnection HOST -Port 7549
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7549

Block port 7549 in the firewall

ufw
sudo ufw deny 7549/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7549 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7549 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7549' -Direction Inbound -Protocol TCP -LocalPort 7549 -Action Block
ufw
sudo ufw deny 7549/udp
iptables
sudo iptables -A INPUT -p udp --dport 7549 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7549 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7549' -Direction Inbound -Protocol UDP -LocalPort 7549 -Action Block

Related ports

7547TR-069 (CWMP)7548tidp7550cloudsignaling7551controlone-con

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