Firstly, this is not an official guide or any official explanation on how Malaysian ISP allocate IP addresses to its users. This explanation is made purely based on my personal observation. It may not be 100% accurate but it does work to a certain extend.
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Every time an Internet user logs into the Internet, they will be allocated with an IP address. There are two types of IP addresses — static and dynamic. “A Static IP address is where a computer uses the same address every time a user logs on to a network, for example the Internet”. On the other hand, a dynamic IP address “may change depending on the addresses available in the set scope”. (source)
In most cases, a general Internet user will be allocated with a dynamic IP address. You can check your IP address using web services such as CheckMyIP and WhatIsMyIP every time you log into the Internet. If your IP address changes each time, you are using a dynamic IP.
Typically, an IP address consists of 4 sets of numbers (0 to 255) separated by a dot (.) in between each set.
A . B . C . D
Example: 124.56.32.86, 60.49.123.56, 219.111.56.102, etc.
I’ll try to explain what wikipedia meant by stating a dynamic IP address changes according to the available address in the set scope. Take for example a scenario where a user is allocated the IP address 218.111.56.237. From my observation, each time the user connects to the Internet from the same area (how wide an area, I have no clue), he might[1] be allocated with an IP address that starts with 218.111.C.D. The number C can be any number +/- 5 of 56 such as 53, 54, 55, 56, 58, and 59. The number D is any number between 0 to 255.
I said might[1] above because apart from IP addresses that starts with 218.111.C.D, that user might be allocated with IP addresses from a different group such as 60.50.C.D as well.
One thing I notice with the sets of IP addresses that starts with 60.50.C.D is that the same user might be allocated with IP addresses where the B (50) can be a number +/- 2 (or more) as well such as 48, 49, 51 and 52.
As a summary, a user that is using a dynamic IP address may have different IP addresses each time he connects to the Internet such as the list below. (D = any number between 0 to 255)
218.111.54.D 60.49.21.D 60.50.82.D 60.52.168.D
218.111.56.D 60.49.22.D 60.50.84.D 60.52.170.D
218.111.57.D 60.49.24.D 60.50.85.D 60.52.172.D
218.111.59.D 60.49.27.D 60.50.87.D 60.52.175.D
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