Robtex

Up: 17.0.0.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 17.0.0.0/22
Down right: 17.0.4.0/22

IP	Type	Hostname
17.0.0.1	PTR	usden5-bb-cr1.corp.apple.com
17.0.0.2	PTR	usden5-bb-cr2.corp.apple.com
17.0.0.3	PTR	usdal4-bb-cr1.corp.apple.com
17.0.0.3	A	hangama.pk
17.0.0.8	PTR	uschi5-bb-cr2.corp.apple.com
17.0.0.9	PTR	ussea4-bb-cr1.corp.apple.com
17.0.0.11	PTR	usrno1-bb-cr1.corp.apple.com
17.0.0.12	PTR	usrno1-bb-cr2.corp.apple.com
17.0.0.16	PTR	usmsc2-bb-cr2.corp.apple.com
17.0.0.17	PTR	usmsc2-bb-cr3.corp.apple.com
17.0.0.18	PTR	usmsc2-bb-cr4.corp.apple.com
17.0.0.19	PTR	usatl4-bb-cr1.corp.apple.com
17.0.0.24	PTR	usscz2-bb-cr2.corp.apple.com
17.0.0.25	PTR	usprz2-bb-cr1.corp.apple.com
17.0.0.26	PTR	usprz2-bb-cr2.corp.apple.com
17.0.0.27	PTR	usprz3-bb-cr1.corp.apple.com
17.0.0.32	PTR	usnyc5-bb-cr2.corp.apple.com
17.0.0.33	PTR	usuqo1-bb-cr1.corp.apple.com
17.0.0.34	PTR	usuqo1-bb-cr2.corp.apple.com
17.0.0.35	PTR	usuqo4-bb-cr1.corp.apple.com
17.0.1.3	PTR	cntnj1-bbisp-gw1.corp.apple.com
17.0.1.8	PTR	dedus1-bbisp-gw2.corp.apple.com
17.0.1.9	PTR	defra1-bbisp-gw1.corp.apple.com
17.0.1.14	PTR	gbmnc1-bbisp-gw2.corp.apple.com
17.0.1.16	PTR	hkhkg1-bbisp-gw2.corp.apple.com
17.0.1.20	PTR	inbom2-bbisp-gw2.corp.apple.com
17.0.1.28	PTR	jptyo7-bbisp-gw2.corp.apple.com
17.0.1.29	PTR	nlams2-bbisp-gw1.corp.apple.com
17.0.1.30	PTR	nlams2-bbisp-gw2.corp.apple.com
17.0.1.34	PTR	sgsin3-bbisp-gw2.corp.apple.com
17.0.1.36	PTR	uklon5-bbisp-gw2.corp.apple.com
17.0.1.43	PTR	uschi5-bbisp-gw1.corp.apple.com
17.0.1.44	PTR	uschi5-bbisp-gw2.corp.apple.com
17.0.1.52	PTR	usdal4-bbisp-gw2.corp.apple.com
17.0.1.55	PTR	usden5-bbisp-gw1.corp.apple.com
17.0.1.60	PTR	ushou1-bbisp-gw2.corp.apple.com
17.0.1.61	PTR	uslax1-bbisp-gw1.corp.apple.com
17.0.1.62	PTR	uslax1-bbisp-gw2.corp.apple.com
17.0.1.63	PTR	uslxa1-bbisp-gw1.corp.apple.com
17.0.1.65	PTR	usmes1-bbisp-gw1.corp.apple.com
17.0.1.66	PTR	usmes1-bbisp-gw2.corp.apple.com
17.0.1.67	PTR	usmia1-bbisp-gw1.corp.apple.com
17.0.1.68	PTR	usmia1-bbisp-gw2.corp.apple.com
17.0.1.74	PTR	usqas2-bbisp-gw2.corp.apple.com
17.0.1.75	PTR	usqas3-bb-pe1.corp.apple.com
17.0.1.76	PTR	usqas3-bb-pe2.corp.apple.com
17.0.1.81	PTR	usscz2-bbisp-gw1.corp.apple.com
17.0.1.83	PTR	ussea4-bbisp-gw1.corp.apple.com
17.0.1.84	PTR	ussea4-bbisp-gw2.corp.apple.com
17.0.1.91	PTR	usuqo4-bbisp-gw1.corp.apple.com
17.0.1.95	PTR	usqas3-bb-pe3.corp.apple.com
17.0.1.96	PTR	usqas3-bb-pe4.corp.apple.com
17.0.1.102	PTR	usuqo1-bb-pe2.corp.apple.com
17.0.1.107	PTR	usmsc2-bb-pe1.corp.apple.com
17.0.1.110	PTR	usmsc2-bb-pe4.corp.apple.com