sxm-airport.com — Caribbean IPv6 Monitor

Score2/4

Overall IPv4-only

Collected2026-10-11 04:33 UTC

Measurement estimates from a single vantage point — not a compliance certification. Guidance below is for operators, not an SLA.

Priority next steps

Publish AAAA records for mail (MX): mailstore1.secureserver.net, smtp.secureserver.net.
Enable DNSSEC signing and publish a DNSKEY at the apex. Use DNSViz to validate the full chain.
Publish a _dmarc TXT record (start with p=none, then tighten). Check policy on dmarcian.

Dual-stack

[2] 2/2/2 [O]

Meaning: Shows how many authoritative name servers exist, and how many IPv6 endpoints are configured, responsive, and operational.

IPv4 2/2/2 · IPv6 2/2/2 · location O

Host	IPv4	IPv6	Probes
`ns04.domaincontrol.com` [O]	173.201.69.2	2603:5:2250::2	ipv4 173.201.69.2 ok; ipv6 2603:5:2250::2 ok;
`ns03.domaincontrol.com` [O]	97.74.101.2	2603:5:2150::2	ipv4 97.74.101.2 ok; ipv6 2603:5:2150::2 ok;

IPv4-only

[2 MX] v4 smtp 6/6/6 v6 smtp 0/0/0 [O]

Meaning: Shows MX footprint and SMTP health per IP family. Operational means an SMTP banner and EHLO exchange succeeded on port 25.

IPv4 SMTP 6/6/6 · IPv6 0/0/0 · location O

Host	IPv4	IPv6	Probes
`mailstore1.secureserver.net` [O]	216.69.141.114, 216.69.141.78, 216.69.141.162	—	ipv4 216.69.141.114 ok; ipv4 216.69.141.78 ok; ipv4 216.69.141.162 ok;
`smtp.secureserver.net` [O]	216.69.141.113, 216.69.141.84, 216.69.141.71	—	ipv4 216.69.141.113 ok; ipv4 216.69.141.84 ok; ipv4 216.69.141.71 ok;

📌 Action item(s):

Publish AAAA records for mail (MX): mailstore1.secureserver.net, smtp.secureserver.net.

Dual-stack

[1] 5/5/5 [O]

Meaning: Shows IPv6 web endpoint readiness for the discovered HTTPS host. Operational means family-specific HTTPS requests complete successfully.

IPv4 5/5/5 · IPv6 5/5/5 · location O

Host	IPv4	IPv6	Probes
`www.sxmairport.com` [O]	104.18.163.83, 104.18.164.83, 104.18.160.83, 104.18.161.83, 104.18.162.83	2606:4700::6812:a153, 2606:4700::6812:a253, 2606:4700::6812:a053, 2606:4700::6812:a453, 2606:4700::6812:a353	ipv4 ok; ipv6 ok;

Unsigned

U/-/-

Meaning: Shows whether DNSKEY data is observed at the apex (signed), absent (unsigned), or unavailable due to lookup error.

Apex DNSKEY presence only — not full chain validation.

📌 Action item(s):

Enable DNSSEC signing and publish a DNSKEY at the apex. Use DNSViz to validate the full chain.

No record

No record — no TXT at _dmarc.sxm-airport.com.

Meaning: Published DMARC policy at _dmarc.sxm-airport.com (DNS TXT). Shows organizational policy (p=) and subdomain policy (sp=) when set.

Publish a DMARC TXT at _dmarc.sxm-airport.com (often start with p=none, then tighten).

Policy publication only — SPF/DKIM not measured. Not part of the 0–4 row score.

📌 Action item(s):

Publish a _dmarc TXT record (start with p=none, then tighten). Check policy on dmarcian.