Robtex

Up: 5.57.16.0/23
Can't show all results, try to descend to a more specific CIDR
Down left: 5.57.17.0/25
Down right: 5.57.17.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
5.57.17.14	A	account.c.booking.com
5.57.17.19	PTR	o1.booking.com
5.57.17.40	A	sap-test-pi.booking.com
5.57.17.51	PTR	admin.booking.com
5.57.17.53	A	spadmin.c.booking.com
5.57.17.62	PTR	chat.booking.com
5.57.17.72	A	marathon-ams4.booking.com
5.57.17.90	PTR	bstatic.com
5.57.17.90	A	k.bstatic.com
5.57.17.90	A	m.bstatic.com
5.57.17.92	PTR	j1.booking.com
5.57.17.96	PTR	iphone-xml.booking.com
5.57.17.99	PTR	q.bstatic.com
5.57.17.99	A	a731204a0e5211e78b7d2ea5ce19ae27.wildcard-ams4.bstatic.com
5.57.17.99	A	9aea3e7a-7d35-4b85-b34f-9121618250bb.wildcard-ams4.bstatic.com
5.57.17.100	A+PTR	r.bstatic.com
5.57.17.101	A	s.lb.bstatic.com
5.57.17.101	A	s.bstatic.com
5.57.17.159	A	nic.hotels
5.57.17.159	A	ratemanager.booking.com
5.57.17.159	A	nic.booking
5.57.17.205	PTR	www.partner.booking.expert
5.57.17.205	A	barcelo.jp
5.57.17.205	A	www.c.booking.expert
5.57.17.210	A	hub-api.booking.com
5.57.17.211	A	experiences.c.booking.com
5.57.17.216	A	autocomplete.c.booking.com
5.57.17.220	PTR	www.booking.com
5.57.17.220	A	www-ipv64-ams4.booking.com
5.57.17.220	A	www.hotelsswitzerland.com
5.57.17.233	A+PTR	supply-xml.booking.com
5.57.17.233	A	supply-xml.c.booking.com
5.57.17.234	A	xml-avchanges.booking.com
5.57.17.234	A	distribution-xml.booking.com
5.57.17.235	A	www-tls12.booking.com
5.57.17.237	A	xml.c.booking.com
5.57.17.238	PTR	ss1.booking.com
5.57.17.241	A	h.c.priceline.com
5.57.17.241	A	h.priceline.com
5.57.17.243	PTR	suite-sites.booking.com
5.57.17.243	A	dd-apartments-zellamsee.com
5.57.17.243	A	riad-paradise.com
5.57.17.245	PTR	carrier.booking.com
5.57.17.245	A	carrier.c.booking.com
5.57.17.249	PTR	api.booking.com