HTTPfy

Port 3096 (ndl-aps)

IANA assigns port 3096 to ndl-aps: Active Print Server Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ndl-aps TCP Active Print Server Port Martin Norman -
ndl-aps UDP Active Print Server Port Martin Norman -

Check what is listening on port 3096

Linux: is anything listening on TCP 3096?
sudo ss -tlnp 'sport = :3096'
Linux: UDP 3096
sudo ss -ulnp 'sport = :3096'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3096
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3096 '
Windows (Command Prompt)
netstat -ano | findstr :3096
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3096 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3096
From Windows
Test-NetConnection HOST -Port 3096
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3096

Block port 3096 in the firewall

ufw
sudo ufw deny 3096/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3096 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3096 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3096' -Direction Inbound -Protocol TCP -LocalPort 3096 -Action Block
ufw
sudo ufw deny 3096/udp
iptables
sudo iptables -A INPUT -p udp --dport 3096 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3096 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3096' -Direction Inbound -Protocol UDP -LocalPort 3096 -Action Block

Related ports

3094rapidmq-reg3095panasas3097itu-bicc-stc3098umm-port

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