I can’t get to my work email which is Microsoft outlook.
I used ChatGPT to hopefully explain the issue with the range:
You were working with a block of IP addresses called a /21, which contains 2048 IPs. This large block can be divided into smaller chunks called /24 blocks, each containing 256 IPs. Think of it like having a big cake (the /21) that’s sliced into smaller pieces (the /24s).
When you updated the entire block (the /21), you expected everything within it to be updated. However, it turns out that not all the slices (the /24s) got updated as expected. Some of these smaller blocks are fine and updated, while others still seem to have issues or didn’t get updated properly.
Because of this inconsistency, we’ve decided to drop the entire /21 range altogether.