So you are designing to backup DNS data. I don't see that available in ServiceNow so you would require a custom table to store this take and you have a couple of options one to update the data from the DNS Server using ServiceNow REST API or dump the DNS data to an SQL database and use that as a datasource to update the custom table in ServiceNow.
Adilrathore didnt answer the question. I would also like to pull in DNS records into servicenow. we have split DNS where the same DNS zone is presented inside our network and another presented to the Internet. I would like to know which DNS records exist in both and which do not. I would also like to match reverse dns records with forward records as over the years things have not been cleaned up properly. I would also like to associate DNS aliases (cname) with their A-names.
Custom table may not be needed, except perhaps for PTR records. Check this DNS Resource Record classes page in ServiceNow docs and let me know if it helps.
I am still trying to figure out how the records are discovered/inserted/maintained/removed (its lifecycle).
