Yes — usaa-email-zone-security.com has IPv6.

Has both IPv4 (A) and IPv6 (AAAA) addresses.

IPv6 readiness

Works over IPv6, with one gap: its mail servers lack IPv6.

Website over IPv6 usaa-email-zone-security.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3034::6815:28ee answers · 443✓ 2606:4700:3031::ac43:8c31 answers · 443	yes
www over IPv6 www.usaa-email-zone-security.com has 2 IPv6 addresses and answers on every one we tested. ✓ 2606:4700:3034::6815:28ee answers · 443✓ 2606:4700:3031::ac43:8c31 answers · 443	yes
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record. mx1.emailsrvr.com ✗mx2.emailsrvr.com ✗	no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up. anastasia.ns.cloudflare.com ✓drake.ns.cloudflare.com ✓	yes

HTTPS over IPv6 · not part of the grade yet
Answered over IPv6 with a server error (HTTP 520) — can't tell whether that's specific to IPv6.

https://usaa-email-zone-security.com/ via 2606:4700:3034::6815:28ee → 520

What's keeping usaa-email-zone-security.com from an A

Mail servers without IPv6
mx1.emailsrvr.com, mx2.emailsrvr.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

usaa-email-zone-security.com Has IPv6

A (IPv4)	172.67.140.49 104.21.40.238
AAAA (IPv6)	2606:4700:3034::6815:28ee 2606:4700:3031::ac43:8c31

www.usaa-email-zone-security.com Has IPv6

A (IPv4)	104.21.40.238 172.67.140.49
AAAA (IPv6)	2606:4700:3034::6815:28ee 2606:4700:3031::ac43:8c31

Browsers on dual-stack networks will usually pick IPv6 here (the "Happy Eyeballs" algorithm races both and prefers v6).

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

IPv6 measurement: usaa-email-zone-security.com
Measured 2026-11-10 23:52:39 UTC by aaaa.bot (one server on Fly.io, region iad)

A (IPv4):    172.67.140.49, 104.21.40.238
AAAA (IPv6): 2606:4700:3034::6815:28ee, 2606:4700:3031::ac43:8c31
www AAAA:    2606:4700:3034::6815:28ee, 2606:4700:3031::ac43:8c31

Readiness grade B: Works over IPv6, with one gap: its mail servers lack IPv6.
- Website over IPv6: usaa-email-zone-security.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3034::6815:28ee: answers (TCP 443)
    2606:4700:3031::ac43:8c31: answers (TCP 443)
- www over IPv6: www.usaa-email-zone-security.com has 2 IPv6 addresses and answers on every one we tested.
    2606:4700:3034::6815:28ee: answers (TCP 443)
    2606:4700:3031::ac43:8c31: answers (TCP 443)
- Mail servers (MX) have IPv6: None of the mail servers has an AAAA record.
- Nameservers have IPv6: 2 of 2 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).

HTTPS over IPv6 (not graded): Answered over IPv6 with a server error (HTTP 520) — can't tell whether that's specific to IPv6.
    https://usaa-email-zone-security.com/ via 2606:4700:3034::6815:28ee -> HTTP 520, certificate: valid
DNS answers via DNS-over-HTTPS (Cloudflare). Method: https://aaaa.bot/method
Permanent link: https://aaaa.bot/r/KpWBBgUfLk

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

Checked 2026-11-10 23:52:39 UTC. Full DNS report: dns.pizza/domain/usaa-email-zone-security.com · Age, certificate and blocklists: how.is/usaa-email-zone-security.com · JSON: /api/v1/usaa-email-zone-security.com