Your IPv{4,6} Address is: 107.20.7.65

IPv6 | IPv4

Note to self: If you're unable to visit IPv6, then your computer doesn't have an Internet routable IPv6 Address.

What is 3.4028237e+38?

• It is 2^128, which is also the number of IPv6 addresses available.

Exactly how big of a number is that?

• It's 340,282,366,920,938,463,463,374,607,431,768,211,456
• Or approximately 340 undecillion or 340 billion billion billion billion

How does that compare to IPv4?

• IPv4 is 2^32, or 4,294,967,296 total addresses. Out of that number, approximately 250 million of those are publicly routable on the Internet.

250 million, you say?

• Yes, as per RFC 3330:
• 10.0.0.0/8 (16,777,216), 172.16.0.0/12 (1,048,576), and 192.168.0.0/16 (65,536) can only be used on private networks, thus should not be reachable, publicly, on the Internet.
• 127.0.0.0/8 (16,777,216) is used as loopback
• 169.254.0.0/16 (65,536) is the 'link local' block and is used in instances where your computer fails to obtain an address from a DHCP server.
• 192.0.2.0/24 (254) is "TEST-NET" and is used for documentation and examples. It should not be publically routed on the Internet.
• 224.0.0.0/4 (268,435,456) is used for multicast.
• 240.0.0.0/4 (268,435,456) is reserved for future use.

What? How many addresses did we waste in IPv4?

• Approximately 557 million just for special use instances. As you divide subnets into smaller chunks, you lose two addresses (network and broadcast address) from each chunk that is not assignable to an network interface

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