Need help with this.

I have a list of multiple PTR records and I'm trying to remove the first IP (technically the last octet) from each PTR to create the record using Powershell.

Example:

Currently PTR:
145.100.94.55.in-addr.arpa
224.100.99.55.in-addr.arpa
100.25.46.100.in-addr.arpa
120.25.46.107.in-addr.arpa
1.25.46.10.in-addr.arpa

Should be:
100.94.55.in-addr.arpa
100.99.55.in-addr.arpa
25.46.100.in-addr.arpa
25.46.107.in-addr.arpa
25.46.10.in-addr.arpa

Seems like I'm stuck and unable to find a way around this. Please help.

99upgrade