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Port 1748 (oracle-em1)

IANA assigns port 1748 to oracle-em1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
oracle-em1 TCP oracle-em1 Bob Purvy -
oracle-em1 UDP oracle-em1 Bob Purvy -

Check what is listening on port 1748

Linux: is anything listening on TCP 1748?
sudo ss -tlnp 'sport = :1748'
Linux: UDP 1748
sudo ss -ulnp 'sport = :1748'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1748
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1748 '
Windows (Command Prompt)
netstat -ano | findstr :1748
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1748 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1748
From Windows
Test-NetConnection HOST -Port 1748
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1748

Block port 1748 in the firewall

ufw
sudo ufw deny 1748/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1748 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1748 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1748' -Direction Inbound -Protocol TCP -LocalPort 1748 -Action Block
ufw
sudo ufw deny 1748/udp
iptables
sudo iptables -A INPUT -p udp --dport 1748 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1748 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1748' -Direction Inbound -Protocol UDP -LocalPort 1748 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.