HTTPfy

Port 34963 (profinet-rtm)

IANA assigns port 34963 to profinet-rtm: PROFInet RT Multicast.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
profinet-rtm TCP PROFInet RT Multicast PNO PROFIBUS Nutzerorganisation e.V. -
profinet-rtm UDP PROFInet RT Multicast PNO PROFIBUS Nutzerorganisation e.V. -

Registry dates for this port: registered 2004-11, last modified 2026-03-16.

Check what is listening on port 34963

Linux: is anything listening on TCP 34963?
sudo ss -tlnp 'sport = :34963'
Linux: UDP 34963
sudo ss -ulnp 'sport = :34963'
Linux / macOS: which process owns the port
sudo lsof -nP -i :34963
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':34963 '
Windows (Command Prompt)
netstat -ano | findstr :34963
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 34963 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 34963
From Windows
Test-NetConnection HOST -Port 34963
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 34963

Block port 34963 in the firewall

ufw
sudo ufw deny 34963/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 34963 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 34963 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 34963' -Direction Inbound -Protocol TCP -LocalPort 34963 -Action Block
ufw
sudo ufw deny 34963/udp
iptables
sudo iptables -A INPUT -p udp --dport 34963 -j DROP
nftables
sudo nft add rule inet filter input udp dport 34963 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 34963' -Direction Inbound -Protocol UDP -LocalPort 34963 -Action Block

Related ports

34567dhanalakshmi, edi_service34962profinet-rt34964profinet-cm34965profinet-cm-sec

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