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Port 7021 (dpserveadmin)

IANA assigns port 7021 to dpserveadmin: DP Serve Admin.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
dpserveadmin TCP DP Serve Admin Allan Stanley -
dpserveadmin UDP DP Serve Admin Allan Stanley -

Check what is listening on port 7021

Linux: is anything listening on TCP 7021?
sudo ss -tlnp 'sport = :7021'
Linux: UDP 7021
sudo ss -ulnp 'sport = :7021'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7021
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7021 '
Windows (Command Prompt)
netstat -ano | findstr :7021
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7021 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7021
From Windows
Test-NetConnection HOST -Port 7021
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7021

Block port 7021 in the firewall

ufw
sudo ufw deny 7021/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7021 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7021 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7021' -Direction Inbound -Protocol TCP -LocalPort 7021 -Action Block
ufw
sudo ufw deny 7021/udp
iptables
sudo iptables -A INPUT -p udp --dport 7021 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7021 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7021' -Direction Inbound -Protocol UDP -LocalPort 7021 -Action Block

Related ports

7019doceri-ctl, doceri-view7020dpserve7022ctdp7023ct2nmcs

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