HTTPfy

Port 1238 (hacl-qs)

IANA assigns port 1238 to hacl-qs.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hacl-qs TCP hacl-qs Farid Faez -
hacl-qs UDP hacl-qs Farid Faez -

Check what is listening on port 1238

Linux: is anything listening on TCP 1238?
sudo ss -tlnp 'sport = :1238'
Linux: UDP 1238
sudo ss -ulnp 'sport = :1238'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1238
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1238 '
Windows (Command Prompt)
netstat -ano | findstr :1238
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1238 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1238
From Windows
Test-NetConnection HOST -Port 1238
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1238

Block port 1238 in the firewall

ufw
sudo ufw deny 1238/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1238 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1238 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1238' -Direction Inbound -Protocol TCP -LocalPort 1238 -Action Block
ufw
sudo ufw deny 1238/udp
iptables
sudo iptables -A INPUT -p udp --dport 1238 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1238 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1238' -Direction Inbound -Protocol UDP -LocalPort 1238 -Action Block

Related ports

1236bvcontrol1237tsdos3901239nmsd1240instantia

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