Chris Adams / Sep 16 2019
Remix of Python by Nextjournal

Network IP range checking

IP range conversion

We need to be able to check for IP ranges

import ipaddress
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network = ipaddress.ip_network("185.203.112.0/22")
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network.num_addresses
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1024
all_the_ips = list(network.hosts())
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all_the_ips[0], all_the_ips[-1]
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(IPv4Address('185.203.112.1'), IPv4Address('185.203.115.254'))
def get_first_and_last_ips(iprange_with_mask):
  network = ipaddress.ip_network(iprange_with_mask)
  list_of_addresses = list(network.hosts())
  return [
    list_of_addresses[0], list_of_addresses[-1]
  ]
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get_first_and_last_ips("185.203.112.0/22")
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[IPv4Address('185.203.112.1'), IPv4Address('185.203.115.254')]
get_first_and_last_ips("147.78.192.0/22")
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[IPv4Address('147.78.192.1'), IPv4Address('147.78.195.254')]
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# don't do this. Making a list from the generator takes aaaaages, and times out.
# get_first_and_last_ips("2a0a:e5c0::/29")
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Checking for IPv6
Some providers will increasingly work in IPv6, so we'll need to check for that too.
import ipaddress
ipv6_network = ipaddress.ip_network("2a0a:e5c0::/29")
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ipv6_network
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IPv6Network('2a0a:e5c0::/29')
ipv6_network.hosts()
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<generator ob...x7fdcd1a0afc0>
ipv6_network[0].exploded
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'2a0a:e5c0:0000:0000:0000:0000:0000:0000'
ipv6_network[-1].exploded
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'2a0a:e5c7:ffff:ffff:ffff:ffff:ffff:ffff'
second_ipv6_network = ipaddress.ip_network("2a09:2940::/29")
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second_ipv6_network[0].exploded, second_ipv6_network[-1].exploded
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('2a09:2940:0000:0000:0000:0000:0000:0000', '2a09:2947:ffff:ffff:ffff:ffff:ffff:ffff')