Query Services <-> Ports

Port to Services (查詢 port.tcp.portsdb.org 或 port.udp.portsdb.org 的 TXT record)
e.g.
# host -t txt 3389.tcp.portsdb.org
3389.tcp.portsdb.org text " Remote Desktop Protocol (RDP)"
3389.tcp.portsdb.org text "ChiliASP"
3389.tcp.portsdb.org text "ms-wbt-server"
# host -t txt 6000.tcp.portsdb.org
6000.tcp.portsdb.org text "x11"
6000.tcp.portsdb.org text "ChiliASP"
6000.tcp.portsdb.org text "eXcursions"
6000.tcp.portsdb.org text "Brick RCAPI"

Servie to Ports (查詢 service.tcp.portsdb.org 的 TXT record)
e.g.
# host -t txt https.tcp.portsdb.org
https.tcp.portsdb.org text "443"
# host -t txt edonkey.tcp.portsdb.org
edonkey.tcp.portsdb.org text "4661"
edonkey.tcp.portsdb.org text "4662"

ref. Ports Database