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Port 1281 (healthd)

IANA assigns port 1281 to healthd.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
healthd TCP healthd James E Housley -
healthd UDP healthd James E Housley -

Check what is listening on port 1281

Linux: is anything listening on TCP 1281?
sudo ss -tlnp 'sport = :1281'
Linux: UDP 1281
sudo ss -ulnp 'sport = :1281'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1281
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1281 '
Windows (Command Prompt)
netstat -ano | findstr :1281
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1281 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1281
From Windows
Test-NetConnection HOST -Port 1281
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1281

Block port 1281 in the firewall

ufw
sudo ufw deny 1281/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1281 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1281 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1281' -Direction Inbound -Protocol TCP -LocalPort 1281 -Action Block
ufw
sudo ufw deny 1281/udp
iptables
sudo iptables -A INPUT -p udp --dport 1281 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1281 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1281' -Direction Inbound -Protocol UDP -LocalPort 1281 -Action Block

Related ports

1279dellwebadmin-21280pictrography1282emperion1283productinfo

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