Robtex

Up: 172.83.40.0/21
Can't show all results, try to descend to a more specific CIDR
Down left: 172.83.40.0/23
Down right: 172.83.42.0/23
(Some of the IP numbers are capped at 3 entries)

IP	Type	Hostname
172.83.40.18	A	ca-vancouver.privateinternetaccess.com
172.83.40.19	A	ca-vancouver.privateinternetaccess.com
172.83.40.22	A	ca-vancouver.privateinternetaccess.com
172.83.40.24	A	ca-vancouver.privateinternetaccess.com
172.83.40.25	A	ca-vancouver.privateinternetaccess.com
172.83.40.27	A	ca-vancouver.privateinternetaccess.com
172.83.40.67	A	ca.protonvpn.com
172.83.40.68	A	ca.protonvpn.com
172.83.40.98	A	ca-vancouver.privateinternetaccess.com
172.83.40.99	A	ca-vancouver.privateinternetaccess.com
172.83.40.100	A	ca-vancouver.privateinternetaccess.com
172.83.40.101	A	ca-vancouver.privateinternetaccess.com
172.83.40.102	A	ca-vancouver.privateinternetaccess.com
172.83.40.103	A	ca-vancouver.privateinternetaccess.com
172.83.40.104	A	ca-vancouver.privateinternetaccess.com
172.83.40.105	A	ca-vancouver.privateinternetaccess.com
172.83.40.106	A	ca-vancouver.privateinternetaccess.com
172.83.40.107	A	ca-vancouver.privateinternetaccess.com
172.83.40.108	A	ca-vancouver.privateinternetaccess.com
172.83.40.109	A	ca-vancouver.privateinternetaccess.com
172.83.40.110	A	ca-vancouver.privateinternetaccess.com
172.83.40.111	A	ca-vancouver.privateinternetaccess.com
172.83.40.112	A	ca-vancouver.privateinternetaccess.com
172.83.40.114	A	ca-vancouver.privateinternetaccess.com
172.83.40.115	A	ca-vancouver.privateinternetaccess.com
172.83.40.200	A	ca399.nordvpn.com
172.83.40.232	A	ca415.nordvpn.com
172.83.41.17	A	dc-548.ptoserver.com
172.83.43.131	A	us-free-02.protonvpn.com
172.83.43.132	A	us-free-02.protonvpn.com
172.83.43.133	A	us-free-02.protonvpn.com
172.83.43.134	A	us-free-02.protonvpn.com
172.83.43.150	A+PTR	matrix.tengkorak.net
172.83.43.150	A	mail.najahprinting.com
172.83.43.150	A	najahprinting.com
172.83.43.203	A	irc.smashthestack.org