The most accessible tool I would recommend is zonemaster.net, a tool developed by AFNIC and The Swedish Internet Foundation. Go to advanced and type in nlm.nih.gov as domain, and then the two nameservers listed above and their ip addresses. Run the test and it will present a status summery of the domain and its name servers. (or just use this link: https://zonemaster.net/en/result/4a7d593dce6e167b)
Alternatively you can use the tool dig command tool which is the industry standard for dns debugging and probing. Installing it on windows/mac is a bit of work, but is very easy and convenient on linux. The command here would be "dig @130.14.55.128 nlm.nih.gov". The @ sign is for saying which nameserver to use, and the last part is the domain name you are looking for.
The most accessible tool I would recommend is zonemaster.net, a tool developed by AFNIC and The Swedish Internet Foundation. Go to advanced and type in nlm.nih.gov as domain, and then the two nameservers listed above and their ip addresses. Run the test and it will present a status summery of the domain and its name servers. (or just use this link: https://zonemaster.net/en/result/4a7d593dce6e167b)
Alternatively you can use the tool dig command tool which is the industry standard for dns debugging and probing. Installing it on windows/mac is a bit of work, but is very easy and convenient on linux. The command here would be "dig @130.14.55.128 nlm.nih.gov". The @ sign is for saying which nameserver to use, and the last part is the domain name you are looking for.