| Name | Parent zone | Child zone | Authoritative IPs |
| Exists? | Glue/additional records | Exists? |
| ns0040.secondary.cloudflare.com | yes | N/A (out of bailiwick) | yes | A | 162.159.32.41 |
| AAAA | 2606:4700:51::a29f:2029 |
| ns0156.secondary.cloudflare.com | yes | N/A (out of bailiwick) | yes | A | 162.159.33.31 |
| AAAA | 2606:4700:59::a29f:211f |
| ns1.irs.gov | yes | A |
162.159.48.214 | yes | A | 162.159.48.214 |
| AAAA | 2400:cb00:2049:1::a29f:30d6 | AAAA | 2400:cb00:2049:1::a29f:30d6 |
| ns2.irs.gov | yes | A |
162.159.49.105 | yes | A | 162.159.49.105 |
| AAAA | 2400:cb00:2049:1::a29f:3169 | AAAA | 2400:cb00:2049:1::a29f:3169 |
| ns3.irs.gov | yes | A |
162.159.48.114 | yes | A | 162.159.48.114 |
| AAAA | 2400:cb00:2049:1::a29f:3072 | AAAA | 2400:cb00:2049:1::a29f:3072 |
| ns4.irs.gov | yes | A |
162.159.49.87 | yes | A | 162.159.49.87 |
| AAAA | 2400:cb00:2049:1::a29f:3157 | AAAA | 2400:cb00:2049:1::a29f:3157 |
| ns5.irs.gov | yes | A |
162.159.48.163 | yes | A | 162.159.48.163 |
| AAAA | 2400:cb00:2049:1::a29f:30a3 | AAAA | 2400:cb00:2049:1::a29f:30a3 |
| ns6.irs.gov | yes | A |
162.159.49.54 | yes | A | 162.159.49.54 |
| AAAA | 2400:cb00:2049:1::a29f:3136 | AAAA | 2400:cb00:2049:1::a29f:3136 |