No — hbr.org is IPv4 only.

Has an IPv4 address but no IPv6 (AAAA) record. IPv6-only visitors can't reach it directly.

D
IPv6 readiness
The website has no IPv6.
Website over IPv6
hbr.org has no AAAA record.		no
www over IPv6
www.hbr.org has no AAAA record.		no
Mail servers (MX) have IPv6
None of the mail servers has an AAAA record.
usb-smtp-inbound-1.mimecast.com ✗usb-smtp-inbound-2.mimecast.com ✗
no
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns-1175.awsdns-18.org ✓ns-1877.awsdns-42.co.uk ✓ns-469.awsdns-58.com ✓ns-604.awsdns-11.net ✓
yes

What's keeping hbr.org from an A

  1. Give hbr.org an IPv6 address
    Ask your hosting provider for the site's IPv6 address (or the hostname to point at), then publish it as an AAAA record. If your host doesn't offer IPv6, a proxy that does can sit in front. How to add an AAAA record
  2. www.hbr.org is an alias of webfarm.hbr.org, which has no IPv6
    www.hbr.org is a CNAME, so it can't also have its own AAAA record. Ask whoever runs webfarm.hbr.org to enable IPv6 there — or replace the alias with the A and AAAA records they give you. Why some hosts don't offer IPv6
  3. Mail servers without IPv6
    usb-smtp-inbound-1.mimecast.com, usb-smtp-inbound-2.mimecast.com have no AAAA record, so mail from IPv6-only servers can't reach them directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.

Check again

hbr.org  IPv4 only

A (IPv4)3.170.3.104
3.170.3.103
3.170.3.73
3.170.3.21
AAAA (IPv6)none

www.hbr.org  IPv4 only

Alias ofwebfarm.hbr.org
A (IPv4)44.206.166.52
98.94.185.47
AAAA (IPv6)none

What this means

Visitors on IPv6-only networks (many mobile carriers) can still reach it, but only through a translator their carrier runs (NAT64). The site itself has no IPv6 address — and you can't make one up from the IPv4. Why some hosts don't offer it

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

 Permanent link: aaaa.bot/r/NyS3DwS5Hg · How we measure

Checked 2026-10-31 06:04:31 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/hbr.org · JSON: /api/v1/hbr.org