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Port 5305 (hacl-test)

IANA assigns port 5305 to hacl-test: HA Cluster Test.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hacl-test TCP HA Cluster Test Eric Soderberg 2, Edward Yim -
hacl-test UDP HA Cluster Test Eric Soderberg 2, Edward Yim -

Check what is listening on port 5305

Linux: is anything listening on TCP 5305?
sudo ss -tlnp 'sport = :5305'
Linux: UDP 5305
sudo ss -ulnp 'sport = :5305'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5305
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5305 '
Windows (Command Prompt)
netstat -ano | findstr :5305
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5305 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5305
From Windows
Test-NetConnection HOST -Port 5305
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5305

Block port 5305 in the firewall

ufw
sudo ufw deny 5305/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5305 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5305 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5305' -Direction Inbound -Protocol TCP -LocalPort 5305 -Action Block
ufw
sudo ufw deny 5305/udp
iptables
sudo iptables -A INPUT -p udp --dport 5305 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5305 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5305' -Direction Inbound -Protocol UDP -LocalPort 5305 -Action Block

Related ports

5303hacl-probe5304hacl-local5306sun-mc-grp5307sco-aip

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