Dotted-decimal notation
The vast number of internet addresses needed in the next 5 years means the familiar 123.46.78 format of addresses is fast running out. That was IPv4 and what IPv6 is promissing is a much larger range of addresses in the format of A1:23:BB:1C
In.addr-arpa (ali66reza)
The address space of IPV4 is limited to 4294967296 possible unique addresses.
192.169.32.1
Since IPv4 addresses ran out a few years ago, the creation of IPv6 was introduced. This contains 128-bit addresses.
To address the exhaustion of available IPv4 addresses, Network Address Translation (NAT) is commonly used. NAT allows multiple devices on a private network to share a single public IP address, enabling continued internet connectivity while conserving the limited pool of IPv4 addresses. This method effectively extends the usability of IPv4 by allowing organizations to use private IP addresses internally and translating them to a public address for external communication.
Well IPv4 is actually just part of the protocol TCP/IP or Transmission Control Protocol / Internet Protocol. IPv4 is the current addressing scheme used by TCP/IP. The newer IPv6 has been rolling out to eventually replace IPv4. Back to what it is… IPv4 is a 32 bit binary addressing scheme by which every computer on the public Internet (most commonly HTTP) or web servers must be assigned a unique address. The address format is comprised of four sets of 8 bit numbers, more commonly referred to as an octet. So 4 * 8 binary numbers give you a 32 bit IPv4 binary address. Because these numbers are binary each place value only has two possibilities, 0 or 1. Because there are only around 4.3 billion addresses available with 2^32 possible IPv4 addresses a new IPv6 was developed which gives a 128 bit addresses space. This should last until there is no room to stand anywhere on the planet. To summarize IPv4 is not a protocol but an addressing scheme that TCP/IP uses to transmit data packets over the Internet or over a private network. Every computer that is directly connected to the Internet needs a unique address. There are what is known as private IPv4 addresses, different topic, and finally IPv4 will eventually be replaced by IPv6.
One major block of addresses reserved for special purposes is the IPv4 experimental address range 240.0.0.0 to 255.255.255.254. Currently, they cannot be used in IPv4 networks. However, these addresses could be used for research or experimentation.
IPv4
In IPv4, the loopback address is 127.0.0.1. In IPv6 it is ::1.
Octets
IPV6 is less vulnerable to DNS Spoofing IPv4 addresses use 32 bit or 4 bytes for addressing IPv6 addresses use eight bit segments.