User-Agent

curl/7.81.0

first seen 2026-06-28 11:20 · last seen 2026-09-04 19:10 · 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_ce5650b735ce16

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 8.18.0, +9 more.The fingerprint page shows the full measured match list. More on the catalog.14
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.The fingerprint page shows the full measured match list. More on the catalog.16

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
6:53+11:0:1360:mss*48,7:mss,sok,ts,nop,ws:flow:01
6:50+14:0:1360:mss*48,7:mss,sok,ts,nop,ws:flow:01
4:51+13:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:113+15:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+:01
4:57+7:0:8960:mss*7,7:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:47+17:0:1418:mss*44,7:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_76
64800_2-4-8-1-3_1440_72
64800_2-4-8-1-3_1282_72
64240_2-4-8-1-3_1418_71
65535_2-1-3-1-1-4_1460_81
62720_2-4-8-1-3_8960_71

Country

fingerprintco-occurrences
US · United States7
NL · Netherlands2
BG · Bulgaria2
IN · India2
CH · Switzerland1
FR · France1
CN · China1

Network (ASN)

fingerprintco-occurrences
AS16509 · Amazon.com, Inc.2
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
AS7922 · Comcast Cable Communications, LLC1
AS3215 · Orange S.A.1