Port 5586 (att-mt-sms)

IANA assigns port 5586 to att-mt-sms: Planning to send mobile terminated SMS to the specific port so that the SMS is not visible to the client.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

att-mt-sms TCP Planning to send mobile terminated SMS to the specific port so that the SMS is not visible to the client ATT -

Registry dates for this port: registered 2014-08-21.

Linux: is anything listening on TCP 5586?

sudo ss -tlnp 'sport = :5586'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5586

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5586 '

Windows (Command Prompt)

netstat -ano | findstr :5586

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5586 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 5586

From Windows

Test-NetConnection HOST -Port 5586

ufw

sudo ufw deny 5586/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5586 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 5586 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 5586' -Direction Inbound -Protocol TCP -LocalPort 5586 -Action Block

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