_cf-custom-hostname.www.nelnet.com. A RRSIG NSEC
Question and response
Question
dig www.nelnet.com. NSEC
Answer
www.nelnet.com. 3600 NSEC _cf-custom-hostname.www.nelnet.com. A RRSIG NSEC
Authority
nelnet.com. 3600 NS pdns04.domaincontrol.com.
nelnet.com. 3600 NS pdns03.domaincontrol.com.
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0