These entries are queried from radb.net using whois, you can try my project getting these.
:AS-SPTEL as-set: AS-SPTEL descr: SPTEL PTE. LTD. 3 Ang Mo Kio Electronics Park Road #03-02 Singapore 567714 members: AS23856,AS137468,AS139883,AS137468:AS-SPTEL-CUST,AS139883:AS-SPTEL-CUST admin-c: SN855-AP tech-c: SN855-AP notify: iskandar.basman [at] sptel.com mnt-by: MAINT-AS23856 changed: iskandar.basman [at] sptel.com 20210120 #01:32:42Z source: RADB last-modified: 2023-11-13T16:03:24Z