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Port 148 (jargon)

IANA assigns port 148 to jargon: Jargon.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
jargon TCP Jargon Bill Weinman -
jargon UDP Jargon Bill Weinman -

Check what is listening on port 148

Linux: is anything listening on TCP 148?
sudo ss -tlnp 'sport = :148'
Linux: UDP 148
sudo ss -ulnp 'sport = :148'
Linux / macOS: which process owns the port
sudo lsof -nP -i :148
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':148 '
Windows (Command Prompt)
netstat -ano | findstr :148
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 148 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 148
From Windows
Test-NetConnection HOST -Port 148
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 148

Block port 148 in the firewall

ufw
sudo ufw deny 148/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 148 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 148 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 148' -Direction Inbound -Protocol TCP -LocalPort 148 -Action Block
ufw
sudo ufw deny 148/udp
iptables
sudo iptables -A INPUT -p udp --dport 148 -j DROP
nftables
sudo nft add rule inet filter input udp dport 148 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 148' -Direction Inbound -Protocol UDP -LocalPort 148 -Action Block

Related ports

146iso-tp0147iso-ip149aed-512150sql-net

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