HTTPfy

Port 35001 (rt-viewer)

IANA assigns port 35001 to rt-viewer: ReadyTech Viewer.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rt-viewer TCP ReadyTech Viewer ReadyTech Corporation -
rt-viewer UDP ReadyTech Viewer ReadyTech Corporation -

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

Check what is listening on port 35001

Linux: is anything listening on TCP 35001?
sudo ss -tlnp 'sport = :35001'
Linux: UDP 35001
sudo ss -ulnp 'sport = :35001'
Linux / macOS: which process owns the port
sudo lsof -nP -i :35001
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':35001 '
Windows (Command Prompt)
netstat -ano | findstr :35001
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 35001 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 35001
From Windows
Test-NetConnection HOST -Port 35001
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 35001

Block port 35001 in the firewall

ufw
sudo ufw deny 35001/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 35001 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 35001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 35001' -Direction Inbound -Protocol TCP -LocalPort 35001 -Action Block
ufw
sudo ufw deny 35001/udp
iptables
sudo iptables -A INPUT -p udp --dport 35001 -j DROP
nftables
sudo nft add rule inet filter input udp dport 35001 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 35001' -Direction Inbound -Protocol UDP -LocalPort 35001 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.