These entries are queried from radb.net using whois, you can try my project getting these.
:AS-NOMINET-NS as-set: AS-NOMINET-NS descr: Nominet Nameservers members: AS43519 mbrs-by-ref: MAINT-AS43519 admin-c: NOMUK-NOC tech-c: NOMUK-NOC mnt-by: MAINT-AS43519 changed: andy.hicks [at] nominet.uk 20240213 # 1129Z source: RADB last-modified: 2024-02-13T11:29:54Z