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Port 8083 (us-srv)

IANA assigns port 8083 to us-srv: Utilistor (Server).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
us-srv TCP Utilistor (Server) Andy Brewerton -
us-srv UDP Utilistor (Server) Andy Brewerton -

Registry dates for this port: registered 2005-08.

Check what is listening on port 8083

Linux: is anything listening on TCP 8083?
sudo ss -tlnp 'sport = :8083'
Linux: UDP 8083
sudo ss -ulnp 'sport = :8083'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8083
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8083 '
Windows (Command Prompt)
netstat -ano | findstr :8083
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8083 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8083
From Windows
Test-NetConnection HOST -Port 8083
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8083

Block port 8083 in the firewall

ufw
sudo ufw deny 8083/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8083 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8083' -Direction Inbound -Protocol TCP -LocalPort 8083 -Action Block
ufw
sudo ufw deny 8083/udp
iptables
sudo iptables -A INPUT -p udp --dport 8083 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8083 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8083' -Direction Inbound -Protocol UDP -LocalPort 8083 -Action Block

Related ports

8081HTTP alternate (8081)8082us-cli8084websnp8086InfluxDB

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