399.app

Observed Aug 24, 2026, 16:42 UTC (1d ago). Every field below was attested with an Ed25519 signature at scan time.

This reading of 399.app was taken 1d ago

399.app is on the survey sweep, which works its way across the whole catalog rather than returning to one name on a schedule. Putting 399.app 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 399.app Watching a domain needs a DRM3 account. The reading above stays free and public either way.
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Not responding
Runs onCloudflare
96 subdomains · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
DRIFT

Steady. No change on record for 399.app in the last day; this reading matches the one before it. The steady record is signed like every other reading. Watch it to catch the next move the moment it lands.

HTTPS probe

Server error Server error (5xx) 503 Service Unavailable - cloudflare down or maintenance
HTTP status503
Servercloudflare
TLS protocolHTTP/2
TLS issuernot observed
Behind Cloudflareyes
Response time1,113 ms
DNS resolutionNOERROR
What this reading means

The site answered with a 5xx, so the edge and TLS are working and the application behind them is not.

It does NOT mean the domain or its DNS is misconfigured - the request got all the way to an application to fail there.

What produces this, in rough order of how often
  • The origin is erroring or mid-deploy.
  • An upstream in front of the origin cannot reach it.

These are the known causes, not a diagnosis of this domain. We recorded that nothing answered; we did not measure why.

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

SIGNED-OUT VIEW Provider names, posture and counts are shown. The record values - every DNS answer, each subdomain hostname, raw TXT, IPs, cert names and WHOIS - are the product. Sign in for the full signed record, or use the API with a key.

DNS records 4

A1NS2CNAME1

TLS certificates 0

None.

Subdomains 96

96 subdomain hostnames observed and signed - the list itself is part of the paid record.

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; the only network request the check makes is for the published public keys.

Verify this receipt
Ed25519 receiptthe raw cryptographic proof
Receipt ID
rcpt_4237604d740adbfd
Output Hash
8b8a00762943a1aad9c96296c3c01d128e4ab305a2fa39ca690d9070734d442a
Signature
ed25519:ac9c097473064029b08f5732f9cff41ee2bcc00678b143bd5e0232e86ea105fe5fe3447173596d8e81e7867dcac2754ebcbc38e71dd20a07e621159ddeea0300
Public Key
ed25519:7aad40f2d6399c207fe2fc15aade04a78324787a355d36725cc90687f9e10cff
Parent
(genesis)
Plane
fast
CONTINUOUS INTERNET TELEMETRY24H DRIFT8,858 material changesacross 7,413 domains · 24h to ~3h agoDNS DRIFT96 domains changed DNS providertop destination koaladns.com · +13 vs yesterdayEMAIL DRIFT2 domains switched email provider24hREGISTRAR DRIFT2 changed registrar24hNOW498 curated domains not reachable+78 vs yesterdaySITE ERRORS17,743 sites serving errorslast probe · 5xx / 404 / TLSBOT DEFENSEbot defense observed on 78,772 sites429 rate-limit / 403 bot-block, a posture signal