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I don't want the answer so much as I have no idea how to find the answer. Can anybody help me with this?

It's a question from homework in a data networking course.

  • 1
    This two-part answer explains it all. You must know the size of the subnets or how many hosts for each subnet in order to calculate how many subnets. – Ron Maupin May 15 at 22:22
  • 4
    The accepted answer has been obsolete for 26 years. – Ron Maupin May 16 at 1:51
  • ip address block that begins with 172.64 is uniquely interpreted as 172.64.0.0/16. subnet mask of 255.255.255.224 is /27. So the subnets count is 2^(27-16) = 2^11 = 2048. – Akina May 16 at 4:39
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  1. https://duckduckgo.com/?q=subnet+calculator+ip+block
  2. http://www.subnet-calculator.com/
  3. Class B network
  4. IP: 172.64.0.1
  5. Subnet Mask: 255.255.255.224
  6. Maximum Subnets: 2048

subnet calculator

  1. Don't forget to show your work.
  • It's my browser's default search engine? – SHawarden May 16 at 1:44
  • 4
    Network classes are dead (please, let them rest in peace), killed in 1993 (26 years ago!) by RFCs 1517, 1518, and 1519, which defined CIDR (Classless Inter-Domain Routing). Modern networking does not use classes. Your answer is obsolete. – Ron Maupin May 16 at 1:50
  • How would you interpret 172.64/27? – SHawarden May 16 at 2:08
  • How would you interpret 172.64/27? No way. Whereas ip address block that begins with 172.64 is uniquely interpreted as 172.64.0.0/16. – Akina May 16 at 4:38
  • @Akina: No, usually 172.64/27 is just interpreted as 172.64.0.0/27 (though omitting the zeroes for a non-/16 is particularly rare). It does not matter what numbers the address block begins with – it only ever was "uniquely /16" in a class-based system, and as Ron noted, that hasn't been correct for decades. – grawity May 16 at 6:11

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