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Port 3827 (netmpi)

IANA assigns port 3827 to netmpi: Netadmin Systems MPI service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netmpi TCP Netadmin Systems MPI service G Runfeldt -
netmpi UDP Netadmin Systems MPI service G Runfeldt -

Registry dates for this port: registered 2007-07-10.

Check what is listening on port 3827

Linux: is anything listening on TCP 3827?
sudo ss -tlnp 'sport = :3827'
Linux: UDP 3827
sudo ss -ulnp 'sport = :3827'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3827
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3827 '
Windows (Command Prompt)
netstat -ano | findstr :3827
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3827 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3827
From Windows
Test-NetConnection HOST -Port 3827
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3827

Block port 3827 in the firewall

ufw
sudo ufw deny 3827/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3827 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3827 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3827' -Direction Inbound -Protocol TCP -LocalPort 3827 -Action Block
ufw
sudo ufw deny 3827/udp
iptables
sudo iptables -A INPUT -p udp --dport 3827 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3827 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3827' -Direction Inbound -Protocol UDP -LocalPort 3827 -Action Block

Related ports

3825ffserver3826warmux3828neteh3829neteh-ext

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