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Port 4105 (shofar)

IANA assigns port 4105 to shofar: Shofar.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
shofar TCP Shofar ShofarNexus -
shofar UDP Shofar ShofarNexus -

Registry dates for this port: registered 2006-07, last modified 2012-02-20.

Check what is listening on port 4105

Linux: is anything listening on TCP 4105?
sudo ss -tlnp 'sport = :4105'
Linux: UDP 4105
sudo ss -ulnp 'sport = :4105'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4105
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4105 '
Windows (Command Prompt)
netstat -ano | findstr :4105
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4105 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4105
From Windows
Test-NetConnection HOST -Port 4105
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4105

Block port 4105 in the firewall

ufw
sudo ufw deny 4105/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4105 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4105 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4105' -Direction Inbound -Protocol TCP -LocalPort 4105 -Action Block
ufw
sudo ufw deny 4105/udp
iptables
sudo iptables -A INPUT -p udp --dport 4105 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4105 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4105' -Direction Inbound -Protocol UDP -LocalPort 4105 -Action Block

Related ports

4103brlp-24104brlp-34106synchronite4107j-ac

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