HTTPfy

Port 2876 (sps-tunnel)

IANA assigns port 2876 to sps-tunnel: SPS Tunnel.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sps-tunnel TCP SPS Tunnel Bill McIntosh -
sps-tunnel UDP SPS Tunnel Bill McIntosh -

Check what is listening on port 2876

Linux: is anything listening on TCP 2876?
sudo ss -tlnp 'sport = :2876'
Linux: UDP 2876
sudo ss -ulnp 'sport = :2876'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2876
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2876 '
Windows (Command Prompt)
netstat -ano | findstr :2876
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2876 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2876
From Windows
Test-NetConnection HOST -Port 2876
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2876

Block port 2876 in the firewall

ufw
sudo ufw deny 2876/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2876 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2876 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2876' -Direction Inbound -Protocol TCP -LocalPort 2876 -Action Block
ufw
sudo ufw deny 2876/udp
iptables
sudo iptables -A INPUT -p udp --dport 2876 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2876 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2876' -Direction Inbound -Protocol UDP -LocalPort 2876 -Action Block

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