authenticate-microsoftonline.com has no address at all.

The name exists but has neither an A nor an AAAA record.

authenticate-microsoftonline.com No address

A (IPv4)	none
AAAA (IPv6)	none

www.authenticate-microsoftonline.com Has IPv6

A (IPv4)	104.21.3.227 172.67.153.189
AAAA (IPv6)	2606:4700:3030::6815:3e3 2606:4700:3032::ac43:99bd

Copy the evidence — a citation-ready record of this measurement

IPv6 measurement: authenticate-microsoftonline.com
Measured 2026-11-05 02:56:07 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    none
AAAA (IPv6): none
www AAAA:    2606:4700:3030::6815:3e3, 2606:4700:3032::ac43:99bd
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/HomoRPZzu8

Permanent link: aaaa.bot/r/HomoRPZzu8 · How we measure

Checked 2026-11-05 02:56:07 UTC. Full DNS report: dns.pizza/domain/authenticate-microsoftonline.com · Age, certificate and blocklists: how.is/authenticate-microsoftonline.com · JSON: /api/v1/authenticate-microsoftonline.com