HTTPfy

Port 5597 (ininmessaging)

IANA assigns port 5597 to ininmessaging: inin secure messaging.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ininmessaging TCP inin secure messaging Mike Gagle 2 -
ininmessaging UDP inin secure messaging Mike Gagle 2 -

Registry dates for this port: registered 2006-05.

Check what is listening on port 5597

Linux: is anything listening on TCP 5597?
sudo ss -tlnp 'sport = :5597'
Linux: UDP 5597
sudo ss -ulnp 'sport = :5597'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5597
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5597 '
Windows (Command Prompt)
netstat -ano | findstr :5597
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5597 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5597
From Windows
Test-NetConnection HOST -Port 5597
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5597

Block port 5597 in the firewall

ufw
sudo ufw deny 5597/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5597 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5597 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5597' -Direction Inbound -Protocol TCP -LocalPort 5597 -Action Block
ufw
sudo ufw deny 5597/udp
iptables
sudo iptables -A INPUT -p udp --dport 5597 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5597 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5597' -Direction Inbound -Protocol UDP -LocalPort 5597 -Action Block

Related ports

5585bis-sync5586att-mt-sms5598mctfeed5599esinstall

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