User-Agent

curl/7.81.0

first seen 2026-06-28 11:20 · last seen 2026-10-18 14:59 · 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 7.81.0
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
t13d3113h2_e8f1e7e78f70_ce5650b735ce28

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn020000_5594a17e7e7e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0, curl 8.13.0, +11 more.The fingerprint page shows the full measured match list. More on the catalog.26
ge20nn030000_042112399351_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0.The fingerprint page shows the full measured match list. More on the catalog.2

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:33554432;2:0|33488897|0|m,p,s,a Match?Exact match in Thumbprint's published controlled catalog captures: php-curl 7.88.1, curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.28

TCP SYN (p0f)

fingerprintco-occurrences
4:50+14:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:56+8:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
6:57+7:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:02
4:40+24:0:1452:65535,6:mss,sok,ts,nop,ws:df,id+:02
4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:45+19:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:42+22:0:1412:65535,6:mss,nop,ws,nop,nop,ts,sok,eol+1:df,ecn:01
6:50+14:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_77
64800_2-4-8-1-3_1440_73
65535_2-1-3-1-1-4_1460_82
65535_2-4-8-1-3_1452_62
64800_2-4-8-1-3_1282_72
42340_2-4-8-1-3_1460_131
42340_2-4-8-1-3_1460_121
62720_2-4-8-1-3_8960_71
65535_2-1-3-1-1-8-4-0-0_1412_61
42360_2-4-8-1-3_1412_111

Country

fingerprintco-occurrences
US · United States11
NL · Netherlands3
BR · Brazil3
IT · Italy3
BG · Bulgaria2
IN · India2
SG · Singapore1
CH · Switzerland1
FR · France1
CN · China1

Network (ASN)

fingerprintco-occurrences
AS16509 · Amazon.com, Inc.3
AS6762 · TELECOM ITALIA SPARKLE S.p.A.3
AS401783 · TOKALA COMMUNICATIONS INC.3
AS50360 · Tamatiya EOOD2
AS60781 · LeaseWeb Netherlands B.V.2
AS55836 · Reliance Jio Infocomm Limited2
AS25773 · RADWARE INC.2
AS8075 · Microsoft Corporation1
AS51852 · Private Layer INC1
AS31898 · Oracle Corporation1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1