Port 5582 (fac-restore)

IANA assigns port 5582 to fac-restore: T-Mobile SMS Protocol Message 3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

fac-restore TCP T-Mobile SMS Protocol Message 3 Jessica Yan -

fac-restore UDP T-Mobile SMS Protocol Message 3 Jessica Yan -

Registry dates for this port: registered 2008-02-19.

Linux: is anything listening on TCP 5582?

sudo ss -tlnp 'sport = :5582'

Linux: UDP 5582

sudo ss -ulnp 'sport = :5582'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5582

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5582 '

Windows (Command Prompt)

netstat -ano | findstr :5582

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5582 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 5582

From Windows

Test-NetConnection HOST -Port 5582

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 5582

ufw

sudo ufw deny 5582/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5582 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 5582 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 5582' -Direction Inbound -Protocol TCP -LocalPort 5582 -Action Block

ufw

sudo ufw deny 5582/udp

iptables

sudo iptables -A INPUT -p udp --dport 5582 -j DROP

nftables

sudo nft add rule inet filter input udp dport 5582 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 5582' -Direction Inbound -Protocol UDP -LocalPort 5582 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.