What is a common use of TXT records in DNS?

TXT records in DNS are primarily used to store text information that can be easily read by humans and machines. One of the most common uses of TXT records is for verification purposes. For example, email providers often require domain owners to add specific TXT records to their DNS settings to verify ownership of the domain. This is especially important for configurations related to email security, such as SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail), which help to prevent unauthorized use of a domain in email communication.

TXT records can also be used for other verification processes, such as domain validation for SSL certificates or setting up Google services. These records can contain various types of information that aid in the verification processes, making them versatile and essential in the management of domain security and reliability.

The other options relate to different functions that are not the primary use of TXT records. For instance, storing IP addresses typically involves A or AAAA records, while defining network routes pertains to protocols like BGP and not TXT records. Assigning dynamic IPs usually involves DHCP, which also does not relate to TXT records. Hence, the choice that best aligns with the common use of TXT records is their role in verification purposes.