Port 7871 (mdm)

IANA assigns port 7871 to mdm: Mobile Device Management.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

mdm TCP Mobile Device Management Dan Harkins -

Registry dates for this port: registered 2011-08-15.

Linux: is anything listening on TCP 7871?

sudo ss -tlnp 'sport = :7871'

Linux / macOS: which process owns the port

sudo lsof -nP -i :7871

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':7871 '

Windows (Command Prompt)

netstat -ano | findstr :7871

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7871 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 7871

From Windows

Test-NetConnection HOST -Port 7871

ufw

sudo ufw deny 7871/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 7871 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 7871 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 7871' -Direction Inbound -Protocol TCP -LocalPort 7871 -Action Block

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