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Port 1363 (ndm-requester)

IANA assigns port 1363 to ndm-requester: Network DataMover Requester.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ndm-requester TCP Network DataMover Requester - -
ndm-requester UDP Network DataMover Requester - -

Check what is listening on port 1363

Linux: is anything listening on TCP 1363?
sudo ss -tlnp 'sport = :1363'
Linux: UDP 1363
sudo ss -ulnp 'sport = :1363'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1363
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1363 '
Windows (Command Prompt)
netstat -ano | findstr :1363
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1363 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1363
From Windows
Test-NetConnection HOST -Port 1363
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1363

Block port 1363 in the firewall

ufw
sudo ufw deny 1363/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1363 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1363 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1363' -Direction Inbound -Protocol TCP -LocalPort 1363 -Action Block
ufw
sudo ufw deny 1363/udp
iptables
sudo iptables -A INPUT -p udp --dport 1363 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1363 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1363' -Direction Inbound -Protocol UDP -LocalPort 1363 -Action Block

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