Pro-tip: never do this outside of ranges explicitly reserved for private use. Multiple times a year I have to deal with some hospital somewhere saying "well <xyz> didn't use to come from that range!" and then dealing with the fact 10,000 medical devices can't have their IPs changed. Recently a similar thing happened with 1.1.1.1 and 1.0.0.1 when Cloudflare went live with them, nobody ever thought those IPs would be handed out.