Robtex

Up: 5.57.16.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 5.57.16.0/26
Down right: 5.57.16.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
5.57.16.11	A	operations.booking.com
5.57.16.14	A	account.c.booking.com
5.57.16.19	A	o1.booking.com
5.57.16.20	A	office.booking.com
5.57.16.21	PTR	outlook.booking.com
5.57.16.23	A	excas-eur.booking.com
5.57.16.26	A+PTR	ka-ppc.booking.com
5.57.16.27	PTR	ka-ppcapp.booking.com
5.57.16.29	PTR	paste.booking.com
5.57.16.31	PTR	jira.booking.com
5.57.16.41	A	cs.booking.com
5.57.16.51	PTR	admin.booking.com
5.57.16.51	A	admin.c.booking.com
5.57.16.52	A+PTR	livelog.booking.com
5.57.16.53	A	spadmin.c.booking.com
5.57.16.54	A+PTR	u.booking.com
5.57.16.62	A+PTR	chat.booking.com
5.57.16.62	A	chat.c.booking.com
5.57.16.72	A	blog.booking.com
5.57.16.90	A+PTR	bstatic.com
5.57.16.90	A	apps.bstatic.com
5.57.16.90	A	w.bstatic.com
5.57.16.92	A	j1.booking.com
5.57.16.93	A	supplier.booking.com
5.57.16.96	A+PTR	iphone-xml-l.booking.com
5.57.16.96	A	iphone-xml.c.booking.com
5.57.16.96	A	attractions-xml.c.booking.com
5.57.16.99	PTR	q.bstatic.com
5.57.16.99	A	28fee61e0db011e7a34770fdce19ae27.wildcard.bstatic.com
5.57.16.99	A	1144ad400de911e79c6f70fdce19ae27.wildcard.bstatic.com
5.57.16.100	A+PTR	r.bstatic.com
5.57.16.100	A	r-dc.bstatic.com
5.57.16.100	A	r-dc.lb.bstatic.com
5.57.16.101	A+PTR	s.bstatic.com
5.57.16.101	A	s.lb.bstatic.com
5.57.16.102	PTR	www-dlb.booking.com
5.57.16.108	A	pulse-api.c.booking.com
5.57.16.108	A	pulse.api.booking.com
5.57.16.112	A+PTR	g.bstatic.com
5.57.16.113	A	h.bstatic.com
5.57.16.114	A+PTR	i.bstatic.com
5.57.16.119	PTR	w3.booking.com
5.57.16.120	PTR	w4.booking.com
5.57.16.121	A	affiliates-hub.booking.com
5.57.16.121	A	sites.booking.com
5.57.16.121	A	www.nic.booking
5.57.16.124	A	ux1.booking.com