CONTINUOUS INTERNET TELEMETRY24H DRIFT1,419 material changesacross 1,231 domains · +965 vs yesterdayDNS DRIFT21 domains changed DNS providertop destination parity.domains · +17 vs yesterdayEMAIL DRIFT5 domains switched email providertop destination pphosted.com · +3 vs yesterdayNOW649 curated domains not answering-1,566 vs yesterdayERRORS3,073 responded with an errorlast probe · 5xx / 404 / TLSTHROTTLED7,915 throttled or blocked our scanner429 rate-limit / 403 bot-blockMOVERtiktok.comDMARC enforcement downgraded: p=reject → no DMARC record24H DRIFT1,419 material changesacross 1,231 domains · +965 vs yesterdayDNS DRIFT21 domains changed DNS providertop destination parity.domains · +17 vs yesterdayEMAIL DRIFT5 domains switched email providertop destination pphosted.com · +3 vs yesterdayNOW649 curated domains not answering-1,566 vs yesterdayERRORS3,073 responded with an errorlast probe · 5xx / 404 / TLSTHROTTLED7,915 throttled or blocked our scanner429 rate-limit / 403 bot-blockMOVERtiktok.comDMARC enforcement downgraded: p=reject → no DMARC record

codeforces.com

Observed 2026-07-17T19:29:17.829Z (4h ago). Every field below was attested with an Ed25519 signature at scan time.

Up right now
Runs onCloudflare
Registered withGandi SAS
Also usesGoogle Search Console
IPv6 · 8 subdomains · education
Every line above is a signed observation. Check the math at the bottom of the page.
INFRASTRUCTURE MAPwhat codeforces.com actually stands on - every host below is a signed observation
codeforces.com
A / AAAA
172.67.68.254104.26.7.164104.26.6.1642606:4700:20::681a:7a4+2 more
Cloudflareserves the site
NS
fred.ns.cloudflare.comjean.ns.cloudflare.com
cloudflare.comanswers its DNS
MX
mx.yandex.net
yandex.netreceives its email

HTTPS probe

ok Responding normally (2xx) 200 OK
HTTP status200
Servercloudflare
TLS protocolHTTP/2
TLS issuernot observed
Behind Cloudflareyes
Response time333 ms
DNS resolutionNOERROR

Every field above is part of the same signed observation as the records below. Blank means not observed, never "none".

DNS Records

A 3

  • 172.67.68.254
  • 104.26.7.164
  • 104.26.6.164

AAAA 3

  • 2606:4700:20::681a:7a4
  • 2606:4700:20::ac43:44fe
  • 2606:4700:20::681a:6a4

MX 1

  • 10mx.yandex.net

TXT 4

  • loaderio=17e74635884b3872197928c7ea0123c5
  • google-site-verification=l4G0k0hCtL44oR2JYae12tG2VSyD0ig5OEN4oKGz6IY
  • v=spf1 ip4:77.234.204.67 ip4:95.163.252.67 include:_spf.yandex.net -all
  • v=DMARC1; p=reject

NS 2

  • fred.ns.cloudflare.com
  • jean.ns.cloudflare.com

SOA 1

  • fred.ns.cloudflare.com dns.cloudflare.com

TLS Certificates (0)

None.

Subdomains (8)

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

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for codeforces.com. It updates itself. It attests a signed observation - not that the site is safe.

DomainDrift signed-observation badge for codeforces.com <a href="https://domaindrift.io/t/codeforces.com"> <img src="https://domaindrift.io/badge/codeforces.com.svg" width="300" height="64" alt="DomainDrift signed observations for codeforces.com"> </a>

Ed25519 Receipt

Receipt ID
af799a6c-6cc2-491a-a8a8-9dca04e99324
Output Hash
d03a46b40e951163bdeb049fd49df5f0cd7b7803d29db9e58d5237806a8165da
Signature
ed25519:16bae5a9206c1e507db8c18dbbf25ccfa73a37e24ffdbc239ce1fac717ad0917a07505d1c54400a52ad70840c38a962edb1cdb7728e844e9757738fdb895550e
Public Key
ed25519:7aad40f2d6399c207fe2fc15aade04a78324787a355d36725cc90687f9e10cff
Parent
(genesis)
Plane
fast
Verify this in your browser