1

I know of two format that use similar notation, Classless Inter Domain Routing (CIDR) and Variable Length Subnet Mask (VLSM). However the numbers after the / is usually less than 32. However in this case it goes up to 120.

Here are some more output from a IP geolocation script I am using. Is this a valid format? According to the code https://github.com/maxmind/getting-started-with-mmdb/blob/57566b3adfd7e89a6510bf743be1577fcbf3a5dc/examples/03-iterate-search-tree.pl#L22 the format is ip/mask_length.

1.0.0.0/120 1.0.1.0/120 1.0.2.0/119 1.0.4.0/118 1.0.8.0/117 1.0.16.0/116 1.0.32.0/115 1.0.64.0/114 1.0.128.0/113 1.1.0.0/120 1.1.1.0/120 1.1.2.0/119 1.1.4.0/118 1.1.8.0/117 1.1.16.0/116 1.1.32.0/115 1.1.64.0/114 1.1.128.0/113 1.2.0.0/119 1.2.2.0/120

Improve this question
2
  • 3
    Your list is nonsense. The stub you linked expects an integer (32bit number) as input and generates an IPv4 dot-quad ascii string. IPv4 addresses with a prefix length greater than 32 are invalid.
    – Ricky
    Jul 7, 2018 at 2:03
  • Thanks. My networking background is very limited. So thanks for confirming my suspension.
    – What is network
    Jul 7, 2018 at 13:15

1 Answer 1

Reset to default
3

Since the / value indicates the length of the subnet prefix and IPv4 uses 32 bits in total, that value can only be 0 through 32. /0 is especially used for the default route 0.0.0.0/0 (=match anything) and /32 is sometimes used to indicate an end node.

I've seen non-standard and ambiguous notations like "10.0.0.0/63" to indicate 10.0.0.0 to 10.0.0.63 - what should be 10.0.0.0/26 - but your list doesn't make any sense.

Improve this answer
0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.