Robtex

Up: 81.231.168.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 81.231.172.0/23
Down right: 81.231.174.0/23

IP	Type	Hostname
81.231.172.16	PTR	81-231-172-16-no135.tbcn.telia.com
81.231.172.35	A+PTR	81-231-172-35-no135.tbcn.telia.com
81.231.172.108	PTR	81-231-172-108-no135.tbcn.telia.com
81.231.172.108	A	maxe.org
81.231.172.126	A+PTR	81-231-172-126-no135.tbcn.telia.com
81.231.172.130	PTR	81-231-172-130-no178.tbcn.telia.com
81.231.172.130	A	81-231-172-130-no135.tbcn.telia.com
81.231.172.136	A+PTR	81-231-172-136-no135.tbcn.telia.com
81.231.172.180	A+PTR	81-231-172-180-no135.tbcn.telia.com
81.231.172.187	A	sohh-systems.org
81.231.172.224	A+PTR	81-231-172-224-no135.tbcn.telia.com
81.231.173.29	A	81-231-173-29-no135.tbcn.telia.com
81.231.173.42	A+PTR	81-231-173-42-no135.tbcn.telia.com
81.231.173.46	PTR	81-231-173-46-no135.tbcn.telia.com
81.231.173.46	A	boxbliss.se
81.231.173.53	A+PTR	81-231-173-53-no135.tbcn.telia.com
81.231.173.60	A+PTR	81-231-173-60-no135.tbcn.telia.com
81.231.173.69	PTR	81-231-173-69-no553.tbcn.telia.com
81.231.173.69	A	81-231-173-69-no135.tbcn.telia.com
81.231.173.71	A	81-231-173-71-no135.tbcn.telia.com
81.231.173.77	A+PTR	81-231-173-77-no135.tbcn.telia.com
81.231.173.78	A	81-231-173-78-no135.tbcn.telia.com
81.231.173.94	A+PTR	81-231-173-94-no135.tbcn.telia.com
81.231.173.116	A+PTR	81-231-173-116-no135.tbcn.telia.com
81.231.173.120	A	81-231-173-120-no135.tbcn.telia.com
81.231.173.128	A	81-231-173-128-no135.tbcn.telia.com
81.231.173.166	A	81-231-173-166-no135.tbcn.telia.com
81.231.173.171	A+PTR	81-231-173-171-no135.tbcn.telia.com
81.231.173.202	A+PTR	81-231-173-202-no135.tbcn.telia.com
81.231.173.223	A	81-231-173-223-no135.tbcn.telia.com
81.231.173.243	A+PTR	81-231-173-243-no135.tbcn.telia.com
81.231.173.247	A	81-231-173-247-no135.tbcn.telia.com
81.231.174.15	A+PTR	81-231-174-15-no135.tbcn.telia.com
81.231.174.119	A+PTR	81-231-174-119-no135.tbcn.telia.com
81.231.174.129	A+PTR	81-231-174-129-no135.tbcn.telia.com
81.231.174.144	A	leifkruger.se
81.231.174.181	A+PTR	81-231-174-181-no135.tbcn.telia.com
81.231.175.42	A	81-231-175-42-no135.tbcn.telia.com
81.231.175.63	A+PTR	81-231-175-63-no176.tbcn.telia.com
81.231.175.68	PTR	81-231-175-68-no135.tbcn.telia.com
81.231.175.76	A	81-231-175-76-no135.tbcn.telia.com
81.231.175.93	A	81-231-175-93-no135.tbcn.telia.com
81.231.175.159	A	81-231-175-159-no135.tbcn.telia.com
81.231.175.203	PTR	81-231-175-203-no176.tbcn.telia.com
81.231.175.203	A	81-231-175-203-no135.tbcn.telia.com
81.231.175.253	PTR	81-231-175-253-no135.tbcn.telia.com
81.231.175.253	A	haggen.nu