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IPV6 vs IPV4 - what are they, what is the major difference & which is most secure? 18 May, 2021   

Many countries around the world are making this century’s biggest move from IPv4 IP address to IPv6. Many governments have taken the step forward to implement IPv6 in their countries, like the US, India, China, etc. Let’s look at some of the statistics on IPv6:

  1. The APNIC statistics show that about 28% of the world countries have adopted IPv6.

  2. 34% of Google users browse using IPv6 connectivity.

  3. According to CISCO statistics, IPv6 users around the world amount to 34.88%.

Still, many businesses and ISPs want to stick with IPv4 and do not understand the need for making the transition to IPv6. To help them decide on choosing IPv6, here are a few important points that advocate why IPv6 is secure and better than IPv4 for users.

What is IPv6?

IPv6 is the latest version of Internet Protocol, i.e., version 6. The Internet Engineering Task Force (IETF) developed it to replace the existing Internet Protocol addresses of version 4, i.e., IPv4 address pools, as IPv4’s were exhausting across RIRs. IPv6 comes with many improvements over IPv4. It simplifies the address size to 128 bits and has unlimited addresses.

What is IPv4?

IPv4 is the current version of Internet Protocol, i.e., version 4. The IP addresses in this version were limited to 4.3 billion addresses, which were running out across RIR’s, especially with the internet getting very popular for the past 10-15 years.

Differences between IPv4 and IPv6:

When we must differentiate between IPv4 and IPv6, it is easier to grasp the differences from this table below:







Address size





IPs allowed

4 Billion addresses

340 Trillion addresses

Which is more secure, IPv4 or IPv6?

IPv6 is more secure than IPv4, as in IPv6, IPSEC (IP Security) is an in-built feature in IPv6 and hence, name resolution is more secure. In IPv6, SEND (Secure Neighbour Discovery) feature is activated which means using cryptographic confirmation, the host can be identified as authentic. SEND also deters name-based attacks, ARP (Address Resolution Protocol) poisoning, etc.

IPv6 provides end-to-end encryption and that is why it is more secure. It also provides privacy, confidentiality, validity, and data authenticity to users.

How to make the transition from IPv4 to IPv6?

An IPv6 broker can help ISP’s or companies to acquire IPv6 address blocks from RIRs. Alternatively, if you do not require to buy IPv6 blocks, your business can even lease IPv6 addresses through the broker.

What must I do with my IPv4s?

With the support and guidelines provided by RIR’s (Regional Internet Registrar) like RIPE, LACNIC, AFRINIC, ARIN, and APNIC, IPv4 brokers act as facilitators between sellers and buyers to make a sale or buy or lease IPs of IPv4. You can sell IPv4 addresses through an IPv4 exchange platform like, where buyers and sellers can bid for IP blocks at competitive market prices. The entire process is transparent and secure.

I want to buy IPv4s for software testing purposes, how can I buy IPv4s?

You can buy IPv4 address space through an IPv4 broker. They will guide you through the buying process and follow all the guidelines laid down by the RIRs and help you acquire IPv4s that are clean and at a fair market price.

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