HTTPfy

Port 532 (netnews)

IANA assigns port 532 to netnews: readnews.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
netnews TCP readnews - -
netnews UDP readnews - -

Check what is listening on port 532

Linux: is anything listening on TCP 532?
sudo ss -tlnp 'sport = :532'
Linux: UDP 532
sudo ss -ulnp 'sport = :532'
Linux / macOS: which process owns the port
sudo lsof -nP -i :532
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':532 '
Windows (Command Prompt)
netstat -ano | findstr :532
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 532 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 532
From Windows
Test-NetConnection HOST -Port 532
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 532

Block port 532 in the firewall

ufw
sudo ufw deny 532/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 532 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 532 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 532' -Direction Inbound -Protocol TCP -LocalPort 532 -Action Block
ufw
sudo ufw deny 532/udp
iptables
sudo iptables -A INPUT -p udp --dport 532 -j DROP
nftables
sudo nft add rule inet filter input udp dport 532 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 532' -Direction Inbound -Protocol UDP -LocalPort 532 -Action Block

Related ports

530courier531conference533netwall534windream

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