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IPv4 or the internet protocol version 4 is the core protocol that supports internetwork transmission of data across the internet and similar packet-switched networks. This connection-less protocol was launched in 1982. Even today, it is the most popular internet protocol that routes maximum internet traffic. It uses a 32-bit integer to uniquely represent the IP addresses. There are approximately 4 billion IPv4 addresses,270 million of which are on public networks. The remaining 18 million addresses are reserved for private networks.

An IPv4 number block is a group of IP numbers that have not yet been assigned to any specific devices on the network. It uses a CIDR (Classless Inter-Domain Routing) for efficient classification and distribution of the IP addresses. According to the routing policies, a group of contiguous numbers denotes a category of IP addresses. Each block is usually represented as a single-digit number or with 16,777,216 contiguous numbers. In the case of a single number representation, it shows a slash sign (/) followed by the respective size of the number block. Across the globe, five regional Internet registries (RIRs) allocate these blocks as per the location.

IPv4s are always in high demand due to their ease of access and popularity. Owing to the rise of e-commerce and internet-based businesses, corporations purchased bulk sets of IP addresses. Even after the introduction of IPv6, organizations still prefer IPv4 for their business. These trends led to the extinction of IPv4 addresses in the marketplace. And by 2011, most of the IPv4 blocks were severely depleted in regional Internet registries. On the other hand, more and more customers are willing to buy IPv4 addresses.

Despite the IPv4 exhaustion, there is a provision for buying IPv4s from the markets. All the allocated IPv4s are not actively in operation. Many large corporations started amassing IPv4 addresses for future purposes. With the advent of the IPv4 marketplace, it became possible for various businesses to purchase this unused IPv4s. The marketplace showcases various IPs that are for sale. A registered user can buy these IPv4 addresses after the verification process. A contractual agreement is generally drawn up between the buyer and the seller for legal validity. For individuals or corporations, the process of direct buying from a marketplace can be confusing and tiresome. The services of an IPv4 registered broker are very useful when purchasing an IPv4.

Yes. Due to the increase in demand for IPv4 addresses, the internet registries allow you to sell excess or unused IPs. In line with the market demand, your corporation can also earn good profits by selling them. But the whole process must follow the policies stipulated by the regional internet registry. Initially, you should register with a marketplace and list the set of IPs that are up for sale. After verification, you will be matched with suitable buyers. Post price negotiation, the transaction can be completed by signing a standard contract. You can use the service of an IPv4 broker for carrying out these processes on your behalf.