o2.em.squarespace.com has no NS records.
NS records for this zone are defined at em.squarespace.com.
NS records for this zone are defined at em.squarespace.com.
Question and response
Question
dig o2.em.squarespace.com. NS
Answer
The response has no answer records.
Authority
squarespace.com. 900 SOA dns1.p06.nsone.net. dns-admin.squarespace.com. 1663787404 3600 600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0