4 ms·

Facebook only has one AS?

• bogomipz 10y ago
  That's not uncommon.
• jzwinck 10y ago
  Most likely yes. There are only about 50k public autonomous systems on the entire Internet. The problem of course is already mentioned by another commenter: some FB assets are in other ASes. https://en.m.wikipedia.org/wiki/Autonomous_system_(Internet) https://en.m.wikipedia.org/wiki/Autonomous_system_(Internet)
• coderholic 10y ago
  Yes, http://ipinfo.io/AS32934 http://ipinfo.io/AS32934. True for most organizations: http://ipinfo.io/countries/us http://ipinfo.io/countries/us
• dredmorbius 10y ago
  That's fairly typical. An AS (identified by an ASN) is an autonomous system. It's comprised of multiple CIDR blocks, contiguous regions of IP addresses. The network definition (by CIDR block) is fairly dynamic, as blocks can be added, deleted, or consolidated. An autonomous system is a single administrative domain over public IP space. Essentially, autonomous systems are what the Internet is inter-networking between, through BGP (border gateway protocol). BGP and AS are what Cisco (and other router) gear are ultimately all about. So yes: organisations typically have one AS. Exceptions are typically the result of corporate mergers (not uncommon) or government space (where the domains are large). (Disclaimer: I'm not a networking bithead, don't muck with routers much, and have a rough knowledge of much of this, though it should be vaguely accurate.)
  • mioelnir 10y ago
    And if you end up with more than one AS due to a merge, you usually pick one them as your primary and connect the other ones to it, then announce their prefixes from your primary, ie. your primary AS becomes transit for your other ones. That way you only have to maintain one external border.