Robtex

Up: 192.0.77.0/24
Can't show all results, try to descend to a more specific CIDR
Down left: 192.0.77.0/26
Down right: 192.0.77.64/26
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
192.0.77.0	PTR	wordpress.com
192.0.77.1	PTR	wordpress.com
192.0.77.2	A+PTR	i0.wp.com
192.0.77.2	A+PTR	i1.wp.com
192.0.77.2	A+PTR	i2.wp.com
192.0.77.3	PTR	wordpress.com
192.0.77.3	A	a.tumblr.com
192.0.77.3	A	64.media.tumblr.com
192.0.77.4	PTR	wordpress.com
192.0.77.7	PTR	wordpress.com
192.0.77.10	PTR	wordpress.com
192.0.77.16	A+PTR	i.cloudup.com
192.0.77.17	A+PTR	cldup.com
192.0.77.17	A	s1.cldup.com
192.0.77.32	PTR	wordpress.com
192.0.77.32	A	a12s.wp.com
192.0.77.32	A	s5.wp.com
192.0.77.33	A	s.wordpress.com
192.0.77.33	A	s3.wordpress.com
192.0.77.33	A	s1.wordpress.com
192.0.77.34	PTR	wordpress.com
192.0.77.34	A	s2.rpcdn.com
192.0.77.34	A	s1.rpcdn.com
192.0.77.36	PTR	wordpress.com
192.0.77.36	A	static.polldaddy.com
192.0.77.36	A	i0.poll.fm
192.0.77.37	PTR	wordpress.com
192.0.77.37	A	c0.wp.com
192.0.77.38	PTR	wordpress.com
192.0.77.38	A	c0.pubmine.com
192.0.77.39	A	149361084.v2.pressablecdn.com
192.0.77.39	A	149346626.v2.pressablecdn.com
192.0.77.39	A	149366099.v2.pressablecdn.com
192.0.77.40	PTR	assets.tumblr.com
192.0.77.40	A	api.tumblr.com
192.0.77.40	A	www.tumblr.com
192.0.77.42	PTR	wordpress.com
192.0.77.48	A+PTR	s.w.org
192.0.77.48	A	ps.w.org
192.0.77.56	PTR	wordpress.com
192.0.77.118	PTR	wordpress.com