cob.edu.bs — Caribbean IPv6 Monitor

Score1/4

Overall IPv4-only

Collected2026-10-03 12:32 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 name server: dns2.cob.edu.bs.
Web measurement was inconclusive or unavailable.
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.

Checks

DNS

IPv4-only

[1] 0/0/0 [I]

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

IPv4 2/2/2 · IPv6 0/0/0 · location I

Host	IPv4	IPv6	Probes
`dns2.cob.edu.bs` [I]	65.75.64.76, 108.60.228.76	—	ipv4 65.75.64.76 ok; ipv4 108.60.228.76 ok;

📌 Action item(s):

Publish AAAA records for name server: dns2.cob.edu.bs.

Mail

Dual-stack

[1 MX] v4 smtp 4/4/4 v6 smtp 4/4/4 [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 4/4/4 · IPv6 4/4/4 · location O

Host	IPv4	IPv6	Probes
`cob-edu-bs.mail.protection.outlook.com` [O]	52.101.41.3, 52.101.50.4, 52.101.10.18, 52.101.10.2	2a01:111:f403:c902::16, 2a01:111:f403:c946::6, 2a01:111:f403:f909::1, 2a01:111:f403:f90f::1	ipv4 52.101.41.3 ok; ipv4 52.101.50.4 ok; ipv4 52.101.10.18 ok; ipv4 52.101.10.2 ok; ipv6 2a01:111:f403:c902::16 ok; ipv6 2a01:111:f403:c946::6 ok; ipv6 2a01:111:f403:f909::1 ok; ipv6 2a01:111:f403:f90f::1 ok;

Web

Unknown

[0] error: Get "https://www.cob.edu.bs/": tls: failed to verify certificate: x509: certificate has expired or is not yet valid: current time 2026-10-03T12:32:41Z is after 2018-04-20T20:11:14Z

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

IPv4 0/0/0 · IPv6 0/0/0 · location -

📌 Action item(s):

Web measurement was inconclusive or unavailable.

DNSSEC

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.

Analyze on DNSViz

📌 Action item(s):

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

DMARC

No record

No record — no TXT at _dmarc.cob.edu.bs.

Meaning: Published DMARC policy at _dmarc.cob.edu.bs (DNS TXT). Shows organizational policy (p=) and subdomain policy (sp=) when set.

Publish a DMARC TXT at _dmarc.cob.edu.bs (often start with p=none, then tighten).

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

Check on dmarcian

📌 Action item(s):

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