About
ipv4 is the IP at the version 4 because it has 4 bytes..
Example: 172.217.20.110
Syntax
Host Identifier
The host identifier of an IPv4 address is represented:
- in the form nnn.nnn.nnn.nnn,
- where nnn is a number from 0 to 255 (ie 8bit)
Example:
- 192.168.1.10
- 85.151.134.69)
An IPv4 address has a size of 32 bits (4×8 bit), which limits the total address space to 4 billion (<math>4294967296 = 2^{32}</math> ) addresses
Wildcard
The wildcard IP address 0.0.0.0 match any possible machine.
IPv4 vs IPv6
The main difference between IPv4 and IPv6 is the number of possible addresses. IPv6 was introduced in 1995 to ensure that the world would not run out anytime soon of IP number.
| IP Version | Bit Address Space | Possible addresses |
|---|---|---|
| IPv4 | 32 | 4 billion |
| IPv6 | 128 | <math>3.4 \times 10^{38}</math> |
Packet
See packet