User-Agent

curl/8.12.1

first seen 2026-06-30 00:27 · last seen 2026-10-21 12:39 · JSON

Distinct clients per day (last 30 days, peak 2/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 8.12.1
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
t13d2713h2_c42a7efa14d1_8d7351bd871b5
t13d141200_db9fa7b5b297_e24568c0d4402
t13d3014h2_1d37bd780c83_2a4a26de67702
t13d3112h2_e8f1e7e78f70_8d633dac7124 Match?Exact match in Thumbprint's published controlled catalog captures: curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1810h2_228bd4bf6806_cf80c7f419ad1
t13i141000_db9fa7b5b297_36bf25f296df1

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.9
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0, curl 7.88.1, curl 8.21.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.3

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, +8 more.The fingerprint page shows the full measured match list. More on the catalog.9

TCP SYN (p0f)

fingerprintco-occurrences
6:238+17:0:1440:65535,9:mss,sok,ts,nop,ws:flow:02
4:50+14:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1460:65535,9:mss,sok,ts,nop,ws:df,id+:01
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:48+16:0:1460:mss*44,5:mss,sok,ts,nop,ws:df,id+:01
4:43+21:0:1396:mss*44,4:mss,sok,ts,nop,ws:df,id+:01
4:44+20:0:1346:65535,9:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_72
65535_2-4-8-1-3_1440_92
65535_2-4-8-1-3_1460_91
64240_2-4-8-1-3_1460_51
64240_2-4-8-1-3_1396_41
65535_2-4-8-1-3_1346_91

Country

fingerprintco-occurrences
US · United States7
DE · Germany3
RU · Russia2

Network (ASN)

fingerprintco-occurrences
AS63025 · NOHAVPS LLC3
AS3209 · Vodafone GmbH3
AS36352 · HostPapa2
AS21928 · T-Mobile USA, Inc.1
AS8402 · PJSC "Vimpelcom"1
AS203273 · NetCrafters OU1
AS31213 · PJSC MegaFon1

TLS supported groups

fingerprintco-occurrences
001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28, rust-reqwest 0.11.27, winhttp 10.0.20348.1, +2 more.The fingerprint page shows the full measured match list. More on the catalog.3
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.2