User-Agent

curl/8.21.0

first seen 2026-07-01 22:56 · last seen 2026-11-02 01:35 · JSON

Last 7 days (9 observations)

Distinct clients per day (last 30 days, peak 166/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 8.21.0
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
t13d2013h1_2b729b4bf6f3_e24568c0d4402097
t13d3013h2_1d37bd780c83_8537cf56674e 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.32
t13d3012h2_1d37bd780c83_882d495ac381 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.21.0, curl 8.22.0, curl 8.23.0, +7 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d2013h1_a09f3c656075_7f0f34a4126d3
t12d2109h1_76e208dd3e22_7af1ed941c262
t13d2012h1_2b729b4bf6f3_36bf25f296df2
t13d131100_f57a46bbacb6_f50d94e863eb Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.27.1, go-net/http 1.27.3, go-net/http 1.27.0, +1 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d2213h1_231e334592e8_e24568c0d4401

HTTP request (JA4H)

fingerprintco-occurrences
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.2103
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.37
ge11nn040000_e1d2031bdfea_000000000000_0000000000001
he11nn030000_fe444ad14866_000000000000_0000000000001
ge11nn030000_f929366f5b36_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, +8 more.The fingerprint page shows the full measured match list. More on the catalog.37

TCP SYN (p0f)

fingerprintco-occurrences
4:50+14:0:1460:65535,4:mss,sok,ts,nop,ws:df,id+:0101
4:51+13:0:1460:65535,4:mss,sok,ts,nop,ws:df,id+:096
4:49+15:0:1460:65535,4:mss,sok,ts,nop,ws:df,id+:095
4:52+12:0:1460:65535,4:mss,sok,ts,nop,ws:df,id+:093
4:49+15:0:1460:65535,2:mss,sok,ts,nop,ws:df,id+:077
4:50+14:0:1460:65535,6:mss,sok,ts,nop,ws:df,id+:070
4:53+11:0:1460:65535,4:mss,sok,ts,nop,ws:df,id+:067
4:48+16:0:1460:65535,4:mss,sok,ts,nop,ws:df,id+:061
4:48+16:0:1460:65535,2:mss,sok,ts,nop,ws:df,id+:060
4:50+14:0:1460:65535,2:mss,sok,ts,nop,ws:df,id+:058

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1460_4677
65535_2-4-8-1-3_1460_2468
65535_2-4-8-1-3_1460_6317
64240_2-4-8-1-3_1460_7156
65535_2-4-8-1-3_1460_876
65535_2-4-8-1-3_1440_636
65535_2-4-8-1-3_1432_226
65535_2-4-8-1-3_1452_423
64800_2-4-8-1-3_1440_720
65535_2-4-8-1-3_1368_217

Country

fingerprintco-occurrences
US · United States2059
PK · Pakistan11
DE · Germany7
TR · Turkey7
NL · Netherlands6
GB · United Kingdom6
RU · Russia6
CZ · Czechia6
AE · United Arab Emirates6
CA · Canada5

Network (ASN)

fingerprintco-occurrences
AS7922 · Comcast Cable Communications, LLC470
AS7018 · AT&T Enterprises, LLC196
AS20115 · Charter Communications LLC102
AS11427 · Charter Communications Inc79
AS10796 · Charter Communications Inc78
AS701 · Verizon Business68
AS16591 · Google Fiber Inc.68
AS6167 · Verizon Business57
AS5650 · Verizon Business51
AS22773 · Cox Communications Inc.45

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.14
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.1