With the way 055s pennants numbers are going, it makes it inherently difficult to track 055s potential fleet basing. Before, I realized that 101-129 numbers belong to North Sea Fleet, 130-159 to the ESF, and 160-199 to SSF. But now it's hard to tell with Type-055 #105 going to SSF.
Maybe the basing for 105-108 to the SSF are temporary, like PLAN just wants 4 055s for each 1 carrier. And since CV-17 might be going to SSF, they wanted 4 055s with her. Just like 4 055s with CV-16 in the NSF, for which their pennants (101-104) makes sense.
It's quite possible to attach current 055s numbers to carriers; essentially 4 055s for each carrier. And with the rumored 8 more being ordered (4 for Type-003/CV-18 and 4 more for the next Type-003/CV-19).
It's possible once those 8 055s and more are built, they will be a re-shuffle of ships with 105-108 joining the NSF and maybe the new ones taking appropriate pennant #s. I always had assumed new Destroyer squadrons would be created with 055s and 052Es filling 14x, 18x, and 19x pennant #s. And maybe PLAN creating another Destroyer squadrons with just 101-109/110 filled with 055s. destroyers.
This is all just pure speculation on my part.
Currently, the PLAN has 6 destroyer squadrons, from north to south,
12X is assigned to 10th squadron,
13X to 3rd squadron,
15X to 6th,
16X to 2nd,
17X to 9th.
But this rule only works for destroyer, for large destroyer, all these squadron will share same pennant numbers, 10X, 18X, and 19X.
For next batch of large destroyer, 055s, I assume they will start from 180.
Here 1st destroyer squadron is different because I guess it won’t get any new destroyers but large destroyers in short time. So the 11X is occupied by 1st and 10th now, but will be empty after all these destroyers retired.
With current speed, the number of destroyer will over 100 soon, then they will have new number, maybe 2XX