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Port 5627 (ninaf)

IANA assigns port 5627 to ninaf: Node Initiated Network Association Forma.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ninaf TCP Node Initiated Network Association Forma Thomas Scholl -
ninaf UDP Node Initiated Network Association Forma Thomas Scholl -

Registry dates for this port: registered 2006-03.

Check what is listening on port 5627

Linux: is anything listening on TCP 5627?
sudo ss -tlnp 'sport = :5627'
Linux: UDP 5627
sudo ss -ulnp 'sport = :5627'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5627
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5627 '
Windows (Command Prompt)
netstat -ano | findstr :5627
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5627 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5627
From Windows
Test-NetConnection HOST -Port 5627
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5627

Block port 5627 in the firewall

ufw
sudo ufw deny 5627/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5627 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5627 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5627' -Direction Inbound -Protocol TCP -LocalPort 5627 -Action Block
ufw
sudo ufw deny 5627/udp
iptables
sudo iptables -A INPUT -p udp --dport 5627 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5627 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5627' -Direction Inbound -Protocol UDP -LocalPort 5627 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.