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Port 475 (tcpnethaspsrv)

IANA assigns port 475 to tcpnethaspsrv.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tcpnethaspsrv TCP tcpnethaspsrv Michael Zunke -
tcpnethaspsrv UDP tcpnethaspsrv Michael Zunke -

Registry dates for this port: registered 2010-07-23.

Check what is listening on port 475

Linux: is anything listening on TCP 475?
sudo ss -tlnp 'sport = :475'
Linux: UDP 475
sudo ss -ulnp 'sport = :475'
Linux / macOS: which process owns the port
sudo lsof -nP -i :475
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':475 '
Windows (Command Prompt)
netstat -ano | findstr :475
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 475 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 475
From Windows
Test-NetConnection HOST -Port 475
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 475

Block port 475 in the firewall

ufw
sudo ufw deny 475/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 475 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 475 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 475' -Direction Inbound -Protocol TCP -LocalPort 475 -Action Block
ufw
sudo ufw deny 475/udp
iptables
sudo iptables -A INPUT -p udp --dport 475 -j DROP
nftables
sudo nft add rule inet filter input udp dport 475 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 475' -Direction Inbound -Protocol UDP -LocalPort 475 -Action Block

Related ports

473hybrid-pop474tn-tl-w1, tn-tl-w2476tn-tl-fd1477ss7ns

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