Unlock elastic ip reverse dns

Dear

I'm trying to release some ips, but I get the message, "cannot be released, please contact aws support to unlock id".

How do I do this release, since the ips have reverse?

18.228.29.100
18.228.29.124
18.228.34.85
18.228.51.172
18.228.53.194
18.228.57.160
18.228.78.135
18.228.148.138
18.228.167.196
18.228.202.10
18.228.209.95
18.228.217.49
18.228.237.237
18.229.3.228
18.229.12.202
18.229.19.51
18.229.19.95
52.67.46.48
52.67.96.11
52.67.101.85
52.67.139.80
52.67.159.164
52.67.167.180
52.67.229.118
54.232.241.58
54.232.247.103
54.233.101.238
54.233.115.50
54.233.149.234
54.233.237.5
54.233.243.173

Wait.

Edited by: romaofr on Mar 11, 2020 5:11 AM

Edited by: romaofr on Mar 12, 2020 10:28 AM