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iSloth
Got fed up remembering the URL for subnet tool websites, and most are kind of rubbish, I like this one... hopefully others do as well :)

Loads still to do, main one would be IPv6... However comments/ideas are always appreciated.

ytjohn
I keep telling myself I'm going to make a command line tool to do just this kind of thing and upload it to pypi. One day.
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iSloth
I've actually got a curl output if you prefer command line...

  tom@iMac: curl subnet.im/192.168.0.1/23
  {
    "ip": "192.168.0.1",
    "netmask": "255.255.254.0",
    "cidr": 23,
    "wildcard": "0.0.1.255",
    "network": "192.168.0.0",
    "broadcast": "192.168.1.255",
    "firsthost": "192.168.0.1",
    "lasthost": "192.168.1.254",
    "totalhosts": 510
  }%
--

Python example :)

  >>> r = requests.get('http://subnet.im/192.168.12.12/30')
  >>> print(r.text)
  {
    "ip": "192.168.12.12",
    "netmask": "255.255.255.252",
    "cidr": 30,
    "wildcard": "0.0.0.3",
    "network": "192.168.12.12",
    "broadcast": "192.168.12.15",
    "firsthost": "192.168.12.13",
    "lasthost": "192.168.12.14",
    "totalhosts": 2
  }
julie1
Simple IPv4 subnet network tool ?
iSloth
Indeed, v6 is on the todo list
danieljp
IPv4 only? PLZ. Here is mine, IPv6 ONLY :P https://github.com/otacon22/ip6calc
iSloth
I'm still trying to find a nice way to show v6 in binary on a web page, having a feeling that I might need to give up... :/ However I like how it shows the scale of things.