Robtex

Up: 23.131.160.0/23
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Down left: 23.131.160.0/25
Down right: 23.131.160.128/25
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
23.131.160.5	A+PTR	ns01.nullroutenetworks.com
23.131.160.6	A	mail.digitalnigel.com
23.131.160.7	PTR	time.nullroutenetworks.com
23.131.160.7	A	2.formlabs.pool.ntp.org
23.131.160.7	A	2.ciscome.pool.ntp.org
23.131.160.213	A	nullroutenetworks.com
23.131.160.228	A+PTR	chiba.osburn.com
23.131.160.228	A	osburn.com
23.131.160.228	A	w7xs.com