HTTPfy

Port 3525 (eisport)

IANA assigns port 3525 to eisport: EIS Server port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
eisport TCP EIS Server port Paul Kraus -
eisport UDP EIS Server port Paul Kraus -

Registry dates for this port: registered 2002-06.

Check what is listening on port 3525

Linux: is anything listening on TCP 3525?
sudo ss -tlnp 'sport = :3525'
Linux: UDP 3525
sudo ss -ulnp 'sport = :3525'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3525
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3525 '
Windows (Command Prompt)
netstat -ano | findstr :3525
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3525 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3525
From Windows
Test-NetConnection HOST -Port 3525
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3525

Block port 3525 in the firewall

ufw
sudo ufw deny 3525/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3525 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3525 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3525' -Direction Inbound -Protocol TCP -LocalPort 3525 -Action Block
ufw
sudo ufw deny 3525/udp
iptables
sudo iptables -A INPUT -p udp --dport 3525 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3525 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3525' -Direction Inbound -Protocol UDP -LocalPort 3525 -Action Block

Related ports

3523odeumservlink3524ecmport3526starquiz-port3527beserver-msg-q

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