smtp.datto.com has no address at all.

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

smtp.datto.com No address

Alias of	mail.datto.com → u45915.wl166.sendgrid.net
A (IPv4)	none
AAAA (IPv6)	none

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

IPv6 measurement: smtp.datto.com
Measured 2026-11-01 20:12:44 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    none
AAAA (IPv6): none
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/CTNvIiO3eN

Permanent link: aaaa.bot/r/CTNvIiO3eN · How we measure

Checked 2026-11-01 20:12:44 UTC. Full DNS report: dns.pizza/domain/smtp.datto.com · JSON: /api/v1/smtp.datto.com