ishares.com

Delegation · None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

Nameservers · These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.blackrock.com: "41824.5"; ns2.blackrock.com: "41824.9"; ns3.blackrock.com: "41824.7"; ns4.blackrock.com: "48878.31"; ns5.blackrock.com: "48878.32"; ns6.blackrock.com: "48878.31". Hide or replace the version string.

Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.

DMARC · DMARC policy is set to 'quarantine'. Consider upgrading to 'reject' for stronger protection once you've verified legitimate emails are passing authentication.

DKIM · The _domainkey name exists but no DKIM key was found under the common selectors. Selectors are provider-specific; check yours with -selector.

MX · The following MX hosts could not be resolved to IPv6 addresses: mxa-00162b01.gslb.pphosted.com, mxb-00162b01.gslb.pphosted.com, mx0a-00162b01.pphosted.com, mx0b-00162b01.pphosted.com

DNSSEC · DNSKEY signatures expire at 2026-10-25T04:33:54Z (in 67h0m0s). Check that re-signing works.

TLS · MTA-STS is not configured, so other mail servers fall back to unencrypted delivery when TLS fails or is stripped by an attacker. Publish a _mta-sts TXT record and a policy at https://mta-sts.<domain>/.well-known/mta-sts.txt.