Robtex

Up: 81.24.240.0/20
Can't show all results, try to descend to a more specific CIDR
Down left: 81.24.248.0/22
Down right: 81.24.252.0/22
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
81.24.248.1	A+PTR	core-bgp-rt1.kerrybroadband.net
81.24.248.1	A	brkhlo.dyndns.org
81.24.248.2	A	ispadmin.kerrybroadband.net
81.24.248.2	A	client.kerrybroadband.net
81.24.248.3	PTR	speedtest3.kerrybroadband.net
81.24.248.3	PTR	speedtest.kerrybroadband.net
81.24.248.3	PTR	speedtest4.kerrybroadband.net
81.24.248.10	A+PTR	ns1.kerrybroadband.net
81.24.248.10	A	kerrybroadband.net
81.24.248.10	A	www.kerrybroadband.net
81.24.248.11	A+PTR	ns2.kerrybroadband.net
81.24.248.14	PTR	smtp.kerrybroadband.net
81.24.248.38	A+PTR	hsnm.kerrybroadband.net
81.24.248.70	A+PTR	blaskets.kerrybroadband.net
81.24.248.138	A+PTR	mail1.pierse.ie
81.24.248.138	A	mail2.pierfitz.ie
81.24.248.165	A	myplace.ie
81.24.249.17	PTR	cust-17.kerrybroadband.net
81.24.249.56	PTR	cust-56.kerrybroadband.net
81.24.249.66	PTR	cust-66.kerrybroadband.net
81.24.252.4	A	kbb.metprogroup.com
81.24.252.5	A	mail.oghmatech.com