User-Agent

curl/8.19.0

first seen 2026-06-26 20:18 · last seen 2026-09-02 23:42 · JSON

Distinct clients per day (last 30 days, peak 1/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 / clientcurl 8.19.0
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
t13d3012h2_1d37bd780c83_882d495ac381 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.21.0, curl 8.22.0, curl 8.20.0, +6 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d2513h1_f5a23f7cfd7b_e24568c0d4403
t13d2013h1_2b729b4bf6f3_e24568c0d4402
q13d0312h3_55b375c5d22e_c0efc70deb602
t13d2012h1_2b729b4bf6f3_36bf25f296df2
t13d2512h1_f5a23f7cfd7b_36bf25f296df1
q13d0313h3_55b375c5d22e_5d09bd47253c1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.7
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.5
ge30nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.3
ge11nn030000_042112399351_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.5

TCP SYN (p0f)

fingerprintco-occurrences
4:38+26:0:1460:65535,8:mss,nop,ws,sok,ts:df,id+:03
4:108+20:0:1440:65535,8:mss,nop,ws,nop,nop,sok:df,id+:02
4:109+19:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:01
6:54+10:0:1421:65535,8:mss,sok,ts,nop,ws:flow:01
4:110+18:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:01
6:57+7:0:1440:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:flow:01
6:57+7:0:1440:65535,8:mss,sok,ts,nop,ws:flow:01
6:57+7:0:1440:mss*44,7:mss,sok,ts,nop,ws:flow:01
6:121+7:0:1440:65535,8:mss,nop,ws,nop,nop,sok:flow:01
6:48+16:0:1440:mss*23,7:mss,sok,ts,nop,ws:flow:01

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-1-3-4-8_1460_83
65535_2-1-3-1-1-4_1440_83
65535_2-4-8-1-3_1421_81
65535_2-1-3-1-1-4_1460_81
64240_2-4-8-1-3_1440_71
65535_2-1-3-1-1-8-4-0-0_1440_61
65535_2-4-8-1-3_1440_81
33120_2-4-8-1-3_1440_71

QUIC transport params

fingerprintco-occurrences
q08_bae576bf37b0 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.3

Country

fingerprintco-occurrences
US · United States6
RU · Russia4
DE · Germany2
TR · Turkey2
HU · Hungary1
KZ · Kazakhstan1

Network (ASN)

fingerprintco-occurrences
AS393886 · Leaseweb USA, Inc.4
AS34602 · MEGASVYAZ LLC3
AS24940 · Hetzner Online GmbH2
AS701 · Verizon Business2
AS34984 · Superonline Iletisim Hizmetleri A.S.2
AS12389 · PJSC Rostelecom1
AS9198 · JSC Kazakhtelecom1
AS5483 · Magyar Telekom Plc.1