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I am planning to build an app which gives information about the network port and the service name for non-opensource based products. Is there a legal implication of building such apps? because someone can know the port on which admin services are running (although the service does authentication before accessing it).

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    This would probably vary based on your country. However, there are already lists of ports used by software, including non-opensource products. The question as it stands might be a better fit on Law.SE – Matthew Nov 26 '15 at 12:18
  • can you please point me to the URL of those list. – user92971 Nov 26 '15 at 12:22
  • There are loads of them - a quick Google suggested speedguide.net/ports.php and adminsub.net/tcp-udp-port-finder but they are by no means the only one – Matthew Nov 26 '15 at 12:25
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There are absolutely no legal implications (in any country) regarding the public information of IANA (Internet Assigned Numbers Authority) and the current registry of service names & transport protocol port numbers.

From the manual;

Port numbers are assigned in various ways, based on three ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private Ports (49152-65535); the difference uses of these ranges is described in [RFC6335]. System Ports are assigned by IETF process for standards-track protocols, as per [RFC6335]. User Ports are assigned by IANA using the "IETF Review" process, the "IESG Approval" process, or the "Expert Review" process, as per [RFC6335]. Dynamic Ports are not assigned.

  • I am not going to list say port 80 for HTTP or 443 for HTTPS but more of user ports . example some IBM well known product's ports 10280 - 10285 and their service names.Anyway these are publicaly available through their support sites or manuals. Just wanted to know If I list them in my website is there a privacy violation problem. thanks :) – user92971 Nov 27 '15 at 3:08

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