Add logic for subnet ID format

[kddejong]

Issue #, if available:

Description of changes:

• Add logic for subnet ID format

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.77%. Comparing base (672f1bd) to head (8a563c2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3761   +/-   ##
=======================================
  Coverage   93.77%   93.77%           
=======================================
  Files         362      363    +1     
  Lines       12375    12394   +19     
  Branches     2528     2530    +2     
=======================================
+ Hits        11605    11623   +18     
  Misses        429      429           
- Partials      341      342    +1     

Flag	Coverage Δ
unittests	93.73% <100.00%> (+<0.01%)	⬆️

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