Port 7701 (nfapi)

IANA assigns port 7701 to nfapi: SCF nFAPI defining MAC/PHY split.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

nfapi SCTP SCF nFAPI defining MAC/PHY split Small Cell Forum -

Registry dates for this port: registered 2017-01-24.

Linux: is anything listening on TCP 7701?

sudo ss -tlnp 'sport = :7701'

Linux / macOS: which process owns the port

sudo lsof -nP -i :7701

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':7701 '

Windows (Command Prompt)

netstat -ano | findstr :7701

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7701 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 7701

From Windows

Test-NetConnection HOST -Port 7701

ufw

sudo ufw deny 7701/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 7701 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 7701 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 7701' -Direction Inbound -Protocol TCP -LocalPort 7701 -Action Block

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