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Port 35004 (rt-classmanager)

IANA assigns port 35004 to rt-classmanager: ReadyTech ClassManager.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rt-classmanager TCP ReadyTech ClassManager ReadyTech Corporation -
rt-classmanager UDP ReadyTech ClassManager ReadyTech Corporation -

Registry dates for this port: registered 2013-09-13.

Check what is listening on port 35004

Linux: is anything listening on TCP 35004?
sudo ss -tlnp 'sport = :35004'
Linux: UDP 35004
sudo ss -ulnp 'sport = :35004'
Linux / macOS: which process owns the port
sudo lsof -nP -i :35004
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':35004 '
Windows (Command Prompt)
netstat -ano | findstr :35004
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 35004 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 35004
From Windows
Test-NetConnection HOST -Port 35004
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 35004

Block port 35004 in the firewall

ufw
sudo ufw deny 35004/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 35004 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 35004 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 35004' -Direction Inbound -Protocol TCP -LocalPort 35004 -Action Block
ufw
sudo ufw deny 35004/udp
iptables
sudo iptables -A INPUT -p udp --dport 35004 -j DROP
nftables
sudo nft add rule inet filter input udp dport 35004 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 35004' -Direction Inbound -Protocol UDP -LocalPort 35004 -Action Block

Related ports

35002rt-sound35003rt-devicemapper35005rt-labtracker35006rt-helper

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