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Port 8401 (sabarsd)

IANA assigns port 8401 to sabarsd.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sabarsd TCP sabarsd Aaron Bilbrey -
sabarsd UDP sabarsd Aaron Bilbrey -

Check what is listening on port 8401

Linux: is anything listening on TCP 8401?
sudo ss -tlnp 'sport = :8401'
Linux: UDP 8401
sudo ss -ulnp 'sport = :8401'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8401
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8401 '
Windows (Command Prompt)
netstat -ano | findstr :8401
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8401 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8401
From Windows
Test-NetConnection HOST -Port 8401
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8401

Block port 8401 in the firewall

ufw
sudo ufw deny 8401/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8401 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8401 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8401' -Direction Inbound -Protocol TCP -LocalPort 8401 -Action Block
ufw
sudo ufw deny 8401/udp
iptables
sudo iptables -A INPUT -p udp --dport 8401 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8401 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8401' -Direction Inbound -Protocol UDP -LocalPort 8401 -Action Block

Related ports

8384marathontp8400cvd8402abarsd8403admind

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