These entries are queried from radb.net using whois, you can try my project getting these.
:AS-NATOLAB as-set: AS-NATOLAB descr: MNT-NRL-25 as-set AS-NATOLAB members: AS-NATOLAB-I,AS-NATOLAB-C,AS-APERNET admin-c: ZENGH-ARIN tech-c: NLN2-ARIN mnt-by: MNT-NRL-25 created: 2020-06-12T21:16:28Z last-modified: 2021-03-31T03:48:54Z source: ARIN as-set: AS-NATOLAB descr: NIS AS Macros mnt-by: MNT-APERNET tech-c: NLN2-ARIN admin-c: NLN2-ARIN members: AS-NATOLAB-I,AS-NATOLAB-C,AS-APERNET changed: hozeng [at] apernet.io 20200626 source: ALTDB