HTTPfy

Port 2775 (smpp)

IANA assigns port 2775 to smpp: SMPP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
smpp TCP SMPP Owen Sullivan -
smpp UDP SMPP Owen Sullivan -

Check what is listening on port 2775

Linux: is anything listening on TCP 2775?
sudo ss -tlnp 'sport = :2775'
Linux: UDP 2775
sudo ss -ulnp 'sport = :2775'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2775
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2775 '
Windows (Command Prompt)
netstat -ano | findstr :2775
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2775 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2775
From Windows
Test-NetConnection HOST -Port 2775
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2775

Block port 2775 in the firewall

ufw
sudo ufw deny 2775/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2775 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2775 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2775' -Direction Inbound -Protocol TCP -LocalPort 2775 -Action Block
ufw
sudo ufw deny 2775/udp
iptables
sudo iptables -A INPUT -p udp --dport 2775 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2775 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2775' -Direction Inbound -Protocol UDP -LocalPort 2775 -Action Block

Related ports

2773rbakcup12774rbakcup22776ridgeway12777ridgeway2

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