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Port 1884 (idmaps)

IANA assigns port 1884 to idmaps: Internet Distance Map Svc.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
idmaps TCP Internet Distance Map Svc Sugih Jamim -
idmaps UDP Internet Distance Map Svc Sugih Jamim -

Check what is listening on port 1884

Linux: is anything listening on TCP 1884?
sudo ss -tlnp 'sport = :1884'
Linux: UDP 1884
sudo ss -ulnp 'sport = :1884'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1884
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1884 '
Windows (Command Prompt)
netstat -ano | findstr :1884
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1884 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1884
From Windows
Test-NetConnection HOST -Port 1884
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1884

Block port 1884 in the firewall

ufw
sudo ufw deny 1884/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1884 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1884 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1884' -Direction Inbound -Protocol TCP -LocalPort 1884 -Action Block
ufw
sudo ufw deny 1884/udp
iptables
sudo iptables -A INPUT -p udp --dport 1884 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1884 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1884' -Direction Inbound -Protocol UDP -LocalPort 1884 -Action Block

Related ports

1882ecsqdmn1883MQTT1885vrtstrapserver1886leoip

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