CONTINUOUS INTERNET TELEMETRY24H DRIFT7,064 material changesacross 6,687 domains · 24h to ~75m ago · -1,699 vs yesterdayNOW560 curated domains not reachablelast probe, steadySITE ERRORS34,304 sites serving errorslast probe · 5xx / 404 / TLSBOT DEFENSEbot defense observed on 156,289 sites429 rate-limit / 403 bot-block, a posture signalMOVERokta.comNo mail routes in the latest observation

z51.ru

Observed Jul 25, 2026, 16:16 UTC (8d ago). Every field below was attested with an Ed25519 signature at scan time.

This reading of z51.ru was taken 8d ago

z51.ru is on the survey sweep, which works its way across the whole catalog rather than returning to one name on a schedule. Putting z51.ru under watch moves it to the fast lane, where DomainDrift re-checks it about every 5 minutes and signs each reading, so a change becomes a dated event within minutes instead of waiting for the sweep to come round.

Watch z51.ru Watching a domain needs a DRM3 account. The reading above stays free and public either way.
Verify this receipt yourself + Watch this domain
Up right now
Secured byLet's Encrypt
Also usesGoogle Search Console
1 subdomain · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat z51.ru actually stands on - every host below is a signed observation
z51.ru
A / AAAA
217.23.140.21
unattributedserves the site
NS
b.ns.selectel.rua.ns.selectel.rud.ns.selectel.ruc.ns.selectel.ru
selectel.ruanswers its DNS
MX
mx1.f-2-b.ru
f-2-b.rureceives its email
TLS
z51.ru
Let's Encryptissued its certificate

DNS Records

A 1

  • 217.23.140.21

MX 1

  • 10mx1.f-2-b.ru

TXT 6

  • google-site-verification=orCeseTP5m47A4J4KyfvRYZ6ot7JtCyuQ9KYAmnzwt8
  • mailru-verification: 7c73ce6defcd57d6
  • _globalsign-domain-verification=LFcPn0CfYSvFAezFByFyhxy4RQnrJA-vMaYvBy-SMx
  • v=spf1 ip4:213.135.90.133 include:spf.retailcrm.pro ip4:217.23.134.49/32 ip4:217.23.140.19/32 ip4:217.23.134.51/32 ~all
  • v=DMARC1; p=reject; rua=mailto:dmarc@z51.ru; ruf=mailto:dmarc@z51.ru
  • v=BIMI1; l=https://z51.ru/upload/email/master-template/logo.svg; a=; avp=brand;

NS 4

  • b.ns.selectel.ru
  • a.ns.selectel.ru
  • d.ns.selectel.ru
  • c.ns.selectel.ru

SOA 1

  • a.ns.selectel.ru support.selectel.ru

TLS Certificates (4)

Common NameIssuerExpires
z51.ru C=US, O=Let's Encrypt, CN=YE2 Mon, 07 Sep 2026 23:10:09 +0000
YE2 C=US, O=ISRG, CN=Root YE Sat, 02 Sep 2028 23:59:59 +0000
Root YE C=US, O=Internet Security Research Group, CN=ISRG Root X2 Thu, 02 Sep 2032 23:59:59 +0000
ISRG Root X2 C=US, O=Internet Security Research Group, CN=ISRG Root X1 Thu, 02 Sep 2032 23:59:59 +0000

Subdomains (1)

The proof

Signed at scan time. Check the math yourself. Every line above is part of one signed observation. Re-hash it and check the Ed25519 signature in your own browser; nothing leaves your machine.

Verify this receipt

Ed25519 Receipt

Receipt ID
rcpt_f2373805146d572b
Output Hash
168119583d7041d833e597f3b99c3483b98d1a421969dc61621dc61c56240626
Signature
ed25519:6d1a32392d0b5be534eea75a1433a60ebba0e3a8cbd3d55f47d72b0b8f2abc24fee253d1ccb2f1f00d5080793c915eb366ede756261b6baec437eb31656f3400
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
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