server name
api.anthropic.com
Mixed audience
A mix of client stacks reach this name, none dominating.
- domain
Read
client diversity
7 distinct client stacks reach this name.
concentration
0.325one client stack dominates — normal for an API or a CDN origin.
Spread is entropy over the fingerprints reaching this domain, not over the domains a fingerprint reaches. It can’t distinguish one scraper from many people — it measures the mix of software, not who runs it.
Footprint
90
observations
7
distinct clients
2026-07-19
first seen
2026-07-23
last seen
Client stacks reaching this name
- t13d3112h1_e8f…e481755emulti-build86%
- Node.js https / axios / got (no ALPN)multi-build5.6%
- Android (Conscrypt) / Flutter (BoringSSL)unclassified4.4%
- Dart dart:io HttpClient (package:http / dio)multi-build1.1%
- Google Chrome / Chromiumrandomising1.1%
- Node.js fetch / undicimulti-build1.1%
- Android (Conscrypt) / Flutter (BoringSSL)unclassified1.1%
Busiest 7 client stacks on this page. Share is the fraction of this name’s observations. Many distinct fingerprints on a low-traffic name is itself worth a look; a blank JA3 is a permuting client — open the fingerprint for its variants.
| client | JA3 | stability | count | share | first seen | last seen |
|---|---|---|---|---|---|---|
| t13d3112h1_e8f1e…e481755e | — | multi-build | 77 | 86% | 2026-07-19 | 2026-07-22 |
| Node.js https / axios / got (no ALPN) Node 18–20 — bundled OpenSSL 3 (same on Debian & Alpine) | — | multi-build | 5 | 5.6% | 2026-07-22 | 2026-07-23 |
| Android (Conscrypt) / Flutter (BoringSSL) mobile-BoringSSL cipher-suite signature — Android system TLS (Play Services, Firebase, OkHttp apps) and Flutter/Dart; any ALPN | d871d02c…34addf | unclassified | 4 | 4.4% | 2026-07-19 | 2026-07-23 |
| Dart dart:io HttpClient (package:http / dio) Dart 3.5–3.12, BoringSSL — ja4_b 5b57614c22b0 is the mobile-BoringSSL cipher list it shares with Android Conscrypt; no ALPN | — | multi-build | 1 | 1.1% | 2026-07-19 | 2026-07-19 |
| Google Chrome / Chromium Chromium cipher-suite signature — Chrome, Edge, Brave, Opera; any extension permutation or version | — | randomising | 1 | 1.1% | 2026-07-19 | 2026-07-19 |
| Node.js fetch / undici Node 22 — bundled OpenSSL 3 (newer) | — | multi-build | 1 | 1.1% | 2026-07-19 | 2026-07-19 |
| Android (Conscrypt) / Flutter (BoringSSL) mobile-BoringSSL cipher-suite signature — Android system TLS (Play Services, Firebase, OkHttp apps) and Flutter/Dart; any ALPN | 3d1ca871…e086bd | unclassified | 1 | 1.1% | 2026-07-19 | 2026-07-19 |