HTTPfy

Port 3701 (netcelera)

IANA assigns port 3701 to netcelera: NetCelera.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netcelera TCP NetCelera Tarek Nabhan -
netcelera UDP NetCelera Tarek Nabhan -

Registry dates for this port: registered 2003-02.

Check what is listening on port 3701

Linux: is anything listening on TCP 3701?
sudo ss -tlnp 'sport = :3701'
Linux: UDP 3701
sudo ss -ulnp 'sport = :3701'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3701
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3701 '
Windows (Command Prompt)
netstat -ano | findstr :3701
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3701 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3701
From Windows
Test-NetConnection HOST -Port 3701
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3701

Block port 3701 in the firewall

ufw
sudo ufw deny 3701/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3701 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3701 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3701' -Direction Inbound -Protocol TCP -LocalPort 3701 -Action Block
ufw
sudo ufw deny 3701/udp
iptables
sudo iptables -A INPUT -p udp --dport 3701 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3701 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3701' -Direction Inbound -Protocol UDP -LocalPort 3701 -Action Block

Related ports

3699kpn-icw3700lrs-paging3702WS-Discovery3703adobeserver-3

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