Port 280 (http-mgmt)

IANA assigns port 280 to http-mgmt.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

http-mgmt TCP http-mgmt Adrian Pell -

http-mgmt UDP http-mgmt Adrian Pell -

Linux: is anything listening on TCP 280?

sudo ss -tlnp 'sport = :280'

Linux: UDP 280

sudo ss -ulnp 'sport = :280'

Linux / macOS: which process owns the port

sudo lsof -nP -i :280

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':280 '

Windows (Command Prompt)

netstat -ano | findstr :280

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 280 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 280

From Windows

Test-NetConnection HOST -Port 280

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

nc -vzu -w 5 HOST 280

ufw

sudo ufw deny 280/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 280 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 280 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 280' -Direction Inbound -Protocol TCP -LocalPort 280 -Action Block

ufw

sudo ufw deny 280/udp

iptables

sudo iptables -A INPUT -p udp --dport 280 -j DROP

nftables

sudo nft add rule inet filter input udp dport 280 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 280' -Direction Inbound -Protocol UDP -LocalPort 280 -Action Block

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