Robtex

Up: 5.57.16.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 5.57.16.0/23
Down right: 5.57.18.0/23
(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
5.57.16.100	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
5.57.16.143	A	bookit.booking.com
5.57.16.143	A	bookingbutton.booking.com
5.57.16.144	A	a1.booking.com
5.57.16.145	A+PTR	ugcupload.booking.com
5.57.16.146	A+PTR	feeds.booking.com
5.57.16.149	A+PTR	static.booking.com
5.57.16.149	A	download.booking.com
5.57.16.150	A	developers.c.booking.com
5.57.16.158	A	connect.booking.com
5.57.16.159	A	bplatweb.c.booking.com
5.57.16.202	A+PTR	derp.booking.com
5.57.16.205	A	barcelo.jp
5.57.16.205	A	barcelo.partners.booking.expert
5.57.16.205	A	vivanta.partner.booking.com
5.57.16.207	PTR	booking-ads.com
5.57.16.209	PTR	join.booking.com
5.57.16.209	A	join.c.booking.com
5.57.16.211	A	experiences.c.booking.com
5.57.16.214	A	images.activehotels.com
5.57.16.214	A	www-l.bookinglokal.com
5.57.16.216	A	autocomplete.c.booking.com
5.57.16.219	PTR	www.activehotels.de
5.57.16.220	PTR	www.booking.com
5.57.16.220	A	wearebooking.com
5.57.16.220	A	hotels-anquilla.com
5.57.16.223	PTR	www.activehotels.es
5.57.16.227	A+PTR	clicktale.booking.com
5.57.16.228	A+PTR	ee1.booking.com
5.57.16.229	A	www.bookaahotels.com
5.57.16.229	A	www-sni.c.booking.com
5.57.16.229	A	track.reservation-booking-system.com
5.57.16.230	PTR	admin.bookings.org
5.57.16.233	A+PTR	supply-xml.booking.com
5.57.16.233	A	partner-data.c.booking.com
5.57.16.233	A	supply-xml.c.booking.com
5.57.16.234	A+PTR	distribution-xml.booking.com
5.57.16.234	A	distribution-xml.c.booking.com
5.57.16.237	A+PTR	xml.booking.com
5.57.16.239	A+PTR	w1.booking.com
5.57.16.239	A	w5.booking.com
5.57.16.239	A	w2.booking.com
5.57.16.240	A	suiteportal.booking.com
5.57.16.243	A	archibaldatthecharlesbridge.cz
5.57.16.243	A	www.archibaldatthecharlesbridge.cz
5.57.16.243	A	suite-sites.booking.com
5.57.16.244	A+PTR	carrier-staging.booking.com
5.57.16.245	A	carrier.booking.com
5.57.16.245	A	carrier.c.booking.com
5.57.16.246	PTR	m1.bstatic.com
5.57.16.248	A	*.activehotels.es
5.57.16.248	A	hotels.activehotels.it
5.57.16.248	A	activehotels.es
5.57.16.250	PTR	mobile-l.api.booking.com
5.57.16.253	A+PTR	secure-supply-xml-dummy.booking.com
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	bplatweb.c.booking.com
5.57.17.159	A	nic.hotels
5.57.17.159	A	ratemanager.booking.com
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
5.57.17.237	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
5.57.18.1	A	paymentcomponent.c.booking.com
5.57.18.91	A+PTR	b1.villas.com
5.57.18.97	A	secure-xml.c.booking.com
5.57.18.98	A+PTR	secure-iphone-xml.booking.com
5.57.18.98	A	secure-iphone-xml.c.booking.com
5.57.18.102	A	secure-admin.booking.com
5.57.18.103	A	hotels-secure.easyjet.com
5.57.18.103	A	secure-easyjet.booking.com
5.57.18.140	A	b1.booking.com
5.57.18.140	A	secure-staging.booking.com
5.57.18.140	A	b2.booking.com
5.57.18.228	A	tls12-secure-distribution-xml.booking.com
5.57.18.229	A	ssl.booking.com
5.57.18.230	A	secure-sni.c.booking.com
5.57.18.230	A	secure-sni.booking.com
5.57.18.231	PTR	secure.booking.com
5.57.18.233	A	secure-attractions-xml.c.booking.com
5.57.18.235	PTR	secure-distribution-xml.booking.com
5.57.18.235	A	secure-distribution-xml.c.booking.com
5.57.18.236	A+PTR	secure.bookings.net
5.57.18.238	PTR	secure-supply-xml.booking.com
5.57.18.238	A	secure-supply-xml.c.booking.com
5.57.18.239	A	ssx2.booking.com
5.57.18.240	PTR	b1.activehotels.com
5.57.18.240	A	hsecure.priceline.com
5.57.18.240	A	hsecure.c.priceline.com
5.57.18.247	A+PTR	secure-office.booking.com
5.57.19.98	A+PTR	secure-iphone-xml.booking.com
5.57.19.102	A	secure-admin.booking.com
5.57.19.228	A	tls12-secure-supply-xml.booking.com
5.57.19.231	PTR	secure.booking.com
5.57.19.233	A	secure-attractions-xml.c.booking.com
5.57.19.238	A	secure-supply-xml.c.booking.com