IPv4 - Internet Protocol version 4

IPv4 (Internet Protocol version 4) defines the network level of the Internet Protocol on which today's internet is based. It defines an IP address as 32-bit (4 byte) address which can be written in a number of different way. Trying to keep this simple, the reason you need to understand something about it, is that SpamCop uses IP addresses as defined by IPv4 in its attempt to filter out spam from the internet.

IP addresses can be written in many different forms, but the one used exclussively by SpamCop is the Dot-decimal notation. All address fall within the range of 0.0.0.0 to 255.255.255.255.

The addresses that are most important to SpamCop are the IP Addresses of the Mail Server(s) used to send/receive email. Without knowing the specific IP addresses involved in handling your email, it is impossilbe to know why you mail may not be getting to it's intended destination.

The number of unassigned Internet addresses, based on IPv4 is running out, so a new classless scheme called CIDR is gradually replacing the system based on classes A, B, and C and is tied to adoption of IPv6 (Internet Protocol version 6).

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CategorySpamCopGlossaryWikiI

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