shell:$ nslookup -timeout=2 -retry=1 'fast.a.klaviyo.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
fast.a.klaviyo.com	canonical name = klaviyo-onsite.map.fastly.net.
Name:	klaviyo-onsite.map.fastly.net
Address: 151.101.194.133
Name:	klaviyo-onsite.map.fastly.net
Address: 151.101.130.133
Name:	klaviyo-onsite.map.fastly.net
Address: 151.101.66.133
Name:	klaviyo-onsite.map.fastly.net
Address: 151.101.2.133