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Port 1635 (edb-server1)

IANA assigns port 1635 to edb-server1: EDB Server 1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
edb-server1 TCP EDB Server 1 Carlos Portela -
edb-server1 UDP EDB Server 1 Carlos Portela -

Check what is listening on port 1635

Linux: is anything listening on TCP 1635?
sudo ss -tlnp 'sport = :1635'
Linux: UDP 1635
sudo ss -ulnp 'sport = :1635'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1635
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1635 '
Windows (Command Prompt)
netstat -ano | findstr :1635
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1635 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1635
From Windows
Test-NetConnection HOST -Port 1635
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1635

Block port 1635 in the firewall

ufw
sudo ufw deny 1635/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1635 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1635 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1635' -Direction Inbound -Protocol TCP -LocalPort 1635 -Action Block
ufw
sudo ufw deny 1635/udp
iptables
sudo iptables -A INPUT -p udp --dport 1635 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1635 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1635' -Direction Inbound -Protocol UDP -LocalPort 1635 -Action Block

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