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sequoiacap.com

Checked 2026-10-22 10:40 UTC · first added 2026-10-21
!Check could not complete

Domain & DNS

error

23 passed 2 warn 0 failed 1 errors

lookups failed for dnssec; results are incomplete

Areas

iRegistration !Delegation iNameservers ✓SOA iDNSSEC !Records

Problems

  • !
    NS sets differ
    Delegation · The nameservers at the parent and in the zone should be the same. Only in the zone: dns1.c01.nsone.net.cn, dns2.c01.nsone.net.cn, dns3.c01.nsone.net.cn, dns4.c01.nsone.net.cn, dns5.c01.nsone.net.cn. dns1.c01.nsone.net.cn, dns1.p04.nsone.net, dns2.c01.nsone.net.cn, dns2.p04.nsone.net, dns3.c01.nsone.net.cn, dns3.p04.nsone.net, dns4.c01.nsone.net.cn, dns4.p04.nsone.net, dns5.c01.nsone.net.cn report NS dns1.c01.nsone.net.cn dns1.p04.nsone.net dns2.c01.nsone.net.cn dns2.p04.nsone.net dns3.c01.nsone.net.cn dns3.p04.nsone.net dns4.c01.nsone.net.cn dns4.p04.nsone.net dns5.c01.nsone.net.cn.
    #7
  • !
    Very low TTLs
    Records · These records have a TTL below 5m, causing extra queries and slower lookups: A (5s), MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 10m; resolvers may use either.
    #32

Recent checks

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Full report

Domain & DNS report for sequoiacap.com ›

Mail

warn

27 passed 4 warn 0 failed

Areas

✓SPF ✓DMARC !DKIM !DNSSEC !MX !TLS ✓BIMI

Problems

  • !
    Not enabled
    DNSSEC · DNSSEC is not enabled for this domain. Consider enabling DNSSEC to protect against DNS spoofing attacks.
    #8
  • !
    Hosts without IPv6
    MX · The following MX hosts could not be resolved to IPv6 addresses: us-smtp-inbound-1.mimecast.com, us-smtp-inbound-2.mimecast.com
    #11
  • !
    1024-bit DKIM key
    DKIM · 1024-bit RSA keys are the minimum and are considered weak today: k1 (1024 bits), selector2 (1024 bits). Rotate to a 2048-bit key.
    #23
  • !
    Not configured
    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.
    #32

Recent checks

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Full report

Mail report for sequoiacap.com ›