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sign21.co.jp

DNS Records

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Hosting & Network

sign21.co.jp runs on AS131965, with email via Google Workspace.

Hosting network
AS131965AS131965
Managed DNS
Self-hosted / other
Email
Google Workspace
IPv6 (AAAA)
Not enabled
CAA pinning
None

Sits alongside 105,873 other sites on AS131965. Stable here since we started watching (Nov 9, 2026).

The apex and www are the same hosting — the apex via A records.

DNS Records for sign21.co.jp

HostnameTypeTTLPriorityContent
sign21.co.jpMX010ALT4.ASPMX.L.GOOGLE.COM
sign21.co.jpMX01ASPMX.L.GOOGLE.COM
sign21.co.jpMX05ALT2.ASPMX.L.GOOGLE.COM
sign21.co.jpMX010ALT3.ASPMX.L.GOOGLE.COM
sign21.co.jpMX05ALT1.ASPMX.L.GOOGLE.COM
sign21.co.jpSOA86400nsk0.secure.ne.jp hostmaster.cpi.ad.jp 2601300003 3600 900 3600000 86400
sign21.co.jpA085.131.197.115
sign21.co.jpNS0nsk0.secure.ne.jp
sign21.co.jpNS0nsk1.secure.ne.jp
sign21.co.jpTXT0v=DKIM1
sign21.co.jpTXT0v=spf1 include:_spf.google.com +a:sv16174.xserver.jp +a:sign21.co.jp +mx include:spf.sender.xserver.jp ~all
sign21.co.jpTXT0google-site-verification=OpFF6u3poNBI7VBP9jmH9O1N5XKQfejSBsYZ3b0n6D8
sign21.co.jpTXT0MS=95F4025594E42B1F1C95A61B7BA2F3FDD01943DD
www.sign21.co.jpA085.131.197.115

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Uptime

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DNS changes

We watch NS, MX, CAA, CNAME, TXT and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.

TLS certificate

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About DNS Records

DNS (Domain Name System) records are instructions that provide information about a domain, including its IP addresses, mail servers, and other services. Common record types include:

  • SOA (Start of Authority) - Contains administrative information about the zone
  • NS (Nameserver) - Specifies authoritative nameservers for the domain
  • A (Address) - Maps a domain to an IPv4 address
  • AAAA - Maps a domain to an IPv6 address
  • CNAME (Canonical Name) - Creates an alias pointing to another domain
  • MX (Mail Exchange) - Specifies mail servers for the domain