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
  }