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Domain names are a critical part of the Internet and the identity of a website. They can be used for email, web hosting and even to route internet traffic. Many people want to find out who owns a particular domain name so they can either scoop up the domain before it expires or contact the owner and see if they are willing to sell it. Other people use Whois to find out about connections between domains for security and incident response reasons. However, it isn’t always easy to get access to all the information that Whois provides. Some registrars impose limits on how often you can query their whois servers. If you exceed these limits, you could be banned for a day or more from using their whois service. To prevent this, it is best to pause a few seconds between each whois lookup or shuffle your list of domains by TLD so you don’t query the same server too many times in quick succession.

Using the whois API allows you to do bulk whois lookups without having to set up a new TCP connection with the server for each query. This is useful for carrying out a large number of whois queries in a short amount of time, or for reducing the impact on a network's bandwidth. To enable this, a whois client must send the "-k" query flag with the first query. Once this is done, the server will maintain a persistent TCP connection that will not close after sending the first reply to the client. Other whois query flags are available, see Table 2.1 for more information.

The RIPE Whois Database contains information about IP networks on the Internet, mainly in the RIPE region [16]. The information is stored as inetnum, inet6num, route and route6 objects. The information in these objects relates to ranges of IP addresses, and is specified using 'prefix notation'.

For example, the inetnum object stores information about a single IP address, whilst the inet6num object holds information about a range of IPv6 addresses.

There are restrictions on how you can use whois data imposed by registries and ICANN. This is to avoid abuse of the whois system for data mining purposes. Some registries even have terms of usage that you must agree to before requesting their whois data. https://www.domainluk.com/bulk-whois-checker This includes not using the data to send spams and marketing messages.

Registries and ICANN also restrict the information that they sell, which can make it difficult to obtain comprehensive whois data. This can be caused by ccTLDs taking extra precautions with personal data, or by them not selling whois data at all.

Bulk parsed whois enables you to do more efficient analysis of whois data. By separating out all the different parts of the whois record, you can get more detailed information about a domain name or connections between domains. This information is vital for security investigations and incident response. If you are interested in gaining access to bulk parsed whois, check out the DomainTools? Enterprise product.