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Port 3534 (urld-port)

IANA assigns port 3534 to urld-port: URL Daemon Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
urld-port TCP URL Daemon Port Jim Binkley -
urld-port UDP URL Daemon Port Jim Binkley -

Registry dates for this port: registered 2002-06.

Check what is listening on port 3534

Linux: is anything listening on TCP 3534?
sudo ss -tlnp 'sport = :3534'
Linux: UDP 3534
sudo ss -ulnp 'sport = :3534'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3534
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3534 '
Windows (Command Prompt)
netstat -ano | findstr :3534
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3534 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3534
From Windows
Test-NetConnection HOST -Port 3534
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3534

Block port 3534 in the firewall

ufw
sudo ufw deny 3534/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3534 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3534 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3534' -Direction Inbound -Protocol TCP -LocalPort 3534 -Action Block
ufw
sudo ufw deny 3534/udp
iptables
sudo iptables -A INPUT -p udp --dport 3534 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3534 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3534' -Direction Inbound -Protocol UDP -LocalPort 3534 -Action Block

Related ports

3532raven-rmp3533raven-rdp3535ms-la3536snac

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