If you need to test the glue records for a domain, you can use the following as a template for the command required in dig.

Glue records only ever exist in the parent zone of a domain name.

Hence in the case of your example.org domain name, first find the .org name servers:

% dig +short org. NS
a0.org.afilias-nst.info.
a2.org.afilias-nst.info.
b0.org.afilias-nst.org.
b2.org.afilias-nst.org.
c0.org.afilias-nst.info.
d0.org.afilias-nst.org.

Then, for as many of these as you feel like testing, explicitly ask those name servers for the NS records for your domain:

% dig +norec @a0.org.afilias-nst.info. example.org. NS

https://serverfault.com/questions/142344/how-to-test-dns-glue-record

Testing DNS Glue Records
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