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Port 4143 (oidsr)

IANA assigns port 4143 to oidsr: Document Replication.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
oidsr TCP Document Replication Norman Brie -
oidsr UDP Document Replication Norman Brie -

Check what is listening on port 4143

Linux: is anything listening on TCP 4143?
sudo ss -tlnp 'sport = :4143'
Linux: UDP 4143
sudo ss -ulnp 'sport = :4143'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4143
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4143 '
Windows (Command Prompt)
netstat -ano | findstr :4143
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4143 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4143
From Windows
Test-NetConnection HOST -Port 4143
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4143

Block port 4143 in the firewall

ufw
sudo ufw deny 4143/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4143 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4143 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4143' -Direction Inbound -Protocol TCP -LocalPort 4143 -Action Block
ufw
sudo ufw deny 4143/udp
iptables
sudo iptables -A INPUT -p udp --dport 4143 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4143 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4143' -Direction Inbound -Protocol UDP -LocalPort 4143 -Action Block

Related ports

4141oirtgsvc4142oidocsvc4145vvr-control4146tgcconnect

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