This is a great archival post from the author on how to read a NVC CASE NUMBER.
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After your I-130/I-140 petition has been approved, you can get your NVC case number from the NVC. Do this by calling the NVC at (603) 334-0700. First provide your USCIS receipt number, which is in your I-797 Notice of ……via USCIS | How To Calculate NVC Case Number