User-Agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +claude-user@anthropic.com)

first seen 2026-07-04 09:44 · last seen 2026-10-23 14:15 · JSON

Distinct clients per day (last 30 days, peak 4/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

Browser / clientClaude-User 1.0
Device classbot
Noteinferred from the self-declared string — a claim, not a measurement; compare with the wire fingerprints above

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.25
t13d091100_f91f431d341e_f50d94e863eb1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_be0d0b335e46_000000000000_00000000000025
ge11nn050000_3658ef221638_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: wget 1.21.4, wget 1.25.0, wget 1.21.3.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:57+7:0:1240:24704,7:mss,sok,ts,nop,ws:df:09
4:58+6:0:1420:mss*46,7:mss,sok,ts,nop,ws:df,id+:08
4:58+6:0:1420:28288,7:mss,sok,ts,nop,ws:df:08
4:58+6:0:1420:mss*46,9:mss,sok,ts,nop,ws:df,id+,ecn:01

TCP SYN (JA4T)

fingerprintco-occurrences
24704_2-4-8-1-3_1240_79
65320_2-4-8-1-3_1420_78
28288_2-4-8-1-3_1420_78
65320_2-4-8-1-3_1420_91

Country

fingerprintco-occurrences
US · United States26

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC26

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.9
11ec,11eb,11ed,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.3, go-net/http 1.26.10.The fingerprint page shows the full measured match list. More on the catalog.1