Information Series on DNS: Part 9

The following series of articles details information of DNS Records, we are covering each setting in the series, providing basic use and purpose. What are NAPTR Records, what are they used for, and how do they work? The most common use of the NAPTR records is in internet telephony. NAPTR records are used in conjunction with the Service Records that support the chaining of different types of DNS records. These records are developed to create complicated rewriting policies that create new domain labels and URLs. These records are to be used with SRV records. Every time a user executes the NAPTR research for your domain, they will get an idea of the types of protocols you have implemented, what types of services does your domain offer, and other such information. Identified by RFC 3403, NAPTR can be created by your DNS provider. What are NS records, what are they used for, and how do they work? Referred to as the nameserver, the NS records tell the world the DNS server that features the exact DNS records. In simple words, the nameserver gives you information about where exactly you can find the IP address of a domain. One domain is often associated with multiple NS records. These records suggest the primary as well as backup servers for this domain. NS records are a must for all types of domains, as the user will not be able to load or access any website or applications without the NS records. The nameserver is also responsible for storing different types of DNS records, including but not limited to, AAAA records, A records, CNAME records, DS records, and so on. If one of the servers is not working properly or is down, all sorts of DNS queries will be redirected to the other server. You will find several types of primary and secondary NS records. Every time you update the primary nameserver, the changes will automatically be updated in the secondary server. The NS records are to be updated when the administrators decide to change the nameserver. These records are identified by RFC 1035. What are NSEC records, what are they used for, and how do they work? The main use of the NSEC records is to present the detailed list of the records that are available for the particular record name. It also points the user to the next record name. Identified by RFC 4034, the NSEC records are part of the DNSSEC records. It is mainly used to confirm that the name for the record doesn’t exist. The format of the NSEC record is somewhat similar to the NXT record, and it mainly consists of two elements - record types and next domain name. Also known as Next Secure Record, the NSEC records consists of the next secure domain.