No — markmonitor.com is IPv4 only.

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

This is a saved measurement from 2026-10-30 23:04 UTC. Check markmonitor.com live now

IPv6 readiness

The website has no IPv6.

Website over IPv6 markmonitor.com has no AAAA record.	no
www over IPv6 www.markmonitor.com has no AAAA record.	no
Mail servers (MX) have IPv6 Every mail server has an AAAA record. markmonitor-com.mail.protection.outlook.com ✓	yes
Nameservers have IPv6 9 of 9 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. ns4.markmonitor.com ✓ns2.markmonitor.com ✓ns6.markmonitor.com ✓ha2.markmonitor.zone ✓ha4.markmonitor.zone ✓ns1.markmonitor.com ✓ns7.markmonitor.com ✓ns3.markmonitor.com ✓ns5.markmonitor.com ✓	yes

What's keeping markmonitor.com from an A

Give markmonitor.com 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
www.markmonitor.com is an alias of dg5q15xzhf06n.cloudfront.net, which has no IPv6
www.markmonitor.com is a CNAME, so it can't also have its own AAAA record. Ask whoever runs dg5q15xzhf06n.cloudfront.net to enable IPv6 there — or replace the alias with the A and AAAA records they give you. Why some hosts don't offer IPv6

Check again

markmonitor.com IPv4 only

A (IPv4)	104.18.39.152 172.64.148.104
AAAA (IPv6)	none

www.markmonitor.com IPv4 only

Alias of	dg5q15xzhf06n.cloudfront.net
A (IPv4)	18.67.76.21 18.67.76.62 18.67.76.97 18.67.76.31
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

IPv6 measurement: markmonitor.com
Measured 2026-10-30 23:04:32 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    104.18.39.152, 172.64.148.104
AAAA (IPv6): none
www AAAA:    none

Readiness grade D: The website has no IPv6.
- Website over IPv6: markmonitor.com has no AAAA record.
- www over IPv6: www.markmonitor.com has no AAAA record.
- Mail servers (MX) have IPv6: Every mail server has an AAAA record.
- Nameservers have IPv6: 9 of 9 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.

Reachability = a TCP connection opened on port 443 (or 80).
No TLS or HTTP request was made.
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/Rt4OfNTgvC

Permanent link: aaaa.bot/r/Rt4OfNTgvC · How we measure

Checked 2026-10-30 23:04:32 UTC. Full DNS report: dns.pizza/domain/markmonitor.com · JSON: /api/v1/markmonitor.com