nanog mailing list archives
Re: Stupid Question maybe?
From: Jeremy Austin <jhaustin () gmail com>
Date: Mon, 17 Dec 2018 20:45:03 -0900
You may find this helpful in your search for knowledge: https://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing "Classful" networking is rarely useful other than for understanding How We Got Here. There's a handy table in the linked article which expresses each IPv4 mask length in relation to how many A, B, or C networks it is. jermudgeon On Mon, Dec 17, 2018 at 8:37 PM Joe <jbfixurpc () gmail com> wrote:
Apologizes in advance for a simple question. I am finding conflicting definitions of Class networks. I was always under the impression that a class "A" network was a /8 a class "B" network was a /16 and a class "C" network was a /24. Recently, I was made aware that a class "A" was indeed a /8 and a class "B" was actually a /12 (172.16/172.31.255.255) while a class "C" is actually a /16. Is this different depending on the IP segment, i.e. if it is part of a RC1918 group it is classed differently (maybe a course I missed?) Or aren't all IP's classed the same. I was always under the impression, /8 = A, /16 = B, /24=C, so rightly, or wrongly I've always seen 10.x.x.x as "A", and 192.168.x.x as "B", with 172.16/12 as one that just a VLSM between the two. Again, apologizes for the simple question, just can't seem to find a solid answer. Happy holidays all the same! -Joe
-- Jeremy Austin jhaustin () gmail com (907) 895-2311 office (907) 803-5422 cell
Current thread:
- Stupid Question maybe? Joe (Dec 17)
- Re: Stupid Question maybe? Jeremy Austin (Dec 17)
- Re: Stupid Question maybe? Owen DeLong (Dec 17)
- Re: Stupid Question maybe? Justin M. Streiner (Dec 18)
- Re: Stupid Question maybe? Tom Beecher (Dec 18)
- Re: Stupid Question maybe? George William Herbert (Dec 18)
- Re: Stupid Question maybe? William Herrin (Dec 18)
- Re: Stupid Question maybe? Brian Kantor (Dec 18)
- Re: Stupid Question maybe? Saku Ytti (Dec 18)
- RE: Stupid Question maybe? Naslund, Steve (Dec 18)
- RE: Stupid Question maybe? David Edelman (Dec 18)
- Re: Stupid Question maybe? Grant Taylor via NANOG (Dec 18)
- Re: Stupid Question maybe? Brian Kantor (Dec 18)