| Name | Parent zone | Child zone | Authoritative IPs |
| Exists? | Glue/additional records | Exists? |
| hrsans1.hrsa.gov | yes | A |
162.99.249.239 | yes | A | 162.99.249.239 |
| AAAA | 2607:f220:410:405::a263:f9ef | AAAA | 2607:f220:410:405::a263:f9ef |
| hrsans2.hrsa.gov | yes | A |
162.99.248.37 | yes | A | 162.99.248.37 |
| AAAA | 2607:f220:41c:400::250 | AAAA | 2607:f220:41c:400::250 |
| ns.nih.gov | yes | A |
128.231.128.251 | yes | A | 128.231.128.251 |
| AAAA | | AAAA | 2607:f220:404:101::80e7:80fb |
| ns2.nih.gov | yes | A |
128.231.64.1 | yes | A | 128.231.64.1 |
| AAAA | | AAAA | 2607:f220:418:4101::80e7:401 |
| ns3.nih.gov | yes | A |
165.112.4.230 | yes | A | 165.112.4.230 |
| AAAA | | AAAA | 2607:f220:402:1801::a570:4e6 |