TCP SYN (p0f)

6:51+13:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-27 08:10 · last seen 2026-10-28 23:22 · JSON

Last 7 days (3 observations)

Distinct clients per day (last 30 days, peak 81/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

IP version6
Initial TTL51+13
Options length0
MSS1440
Window sizemss*45
Window scale7
Options layoutmss,sok,ts,nop,ws
Quirksflow
Payload class0

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
t13d3013h2_1d37bd780c83_8537cf56674e85
t13d1516h2_8daaf6152771_806a8c22fdea Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, chromium 151.0.7922.34, +28 more.The fingerprint page shows the full measured match list. More on the catalog.12
t13d3112h2_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.5.0, php-curl 7.88.1.The fingerprint page shows the full measured match list. More on the catalog.7
t13d251100_b78ed14e2fd0_ab7e3b40a6774
t12d290700_fc2078a0b8c0_8c06664c3ac54
t13d151000_8daaf6152771_18e8a06d9b2d4
t13d1812h1_85036bcba153_d41ae481755e3
t13d131100_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.5, go-net/http 1.26.4.The fingerprint page shows the full measured match list. More on the catalog.2
t13d2013h1_2b729b4bf6f3_e24568c0d4402
t13d131100_f57a46bbacb6_e5728521abd41

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000083
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
ge20nr09enus_d05bf764aa1e_000000000000_0000000000006
ge11nr040000_e1d2031bdfea_000000000000_0000000000004
ge11nn070000_ae5913c5f5ca_000000000000_0000000000004
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
ge20nn10enus_f7ad313dcc59_000000000000_0000000000003
ge11nn040000_e1d2031bdfea_000000000000_0000000000002
ge11nn040000_bfa5a9b89dd6_000000000000_0000000000002
ge11nn05en00_61812dc1cc58_000000000000_0000000000002

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.86
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chromium 149.0.7827.102, chrome 152.0.7977.83, +81 more.The fingerprint page shows the full measured match list. More on the catalog.7
3:100;4:10485760;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1, curl 8.5.0.The fingerprint page shows the full measured match list. More on the catalog.7
1:65536;2:0;4:6291456;6:262144|15663105|1:1:0:256|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 151.0.7922.34, chrome 151.0.7922.137, +57 more.The fingerprint page shows the full measured match list. More on the catalog.4
1:4096;2:0;4:65535;5:16384;3:100;6:65536|16777216|0|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.2
2:0;4:2097152;3:100;9:1|10485760|0|m,s,p,a1
1:65536;2:0;4:6291456;6:262144|15663105|7:1:0:220|m,a,s,p1

TCP SYN (JA4T)

fingerprintco-occurrences
64800_2-4-8-1-3_1440_7132

User-Agent

fingerprintco-occurrences
curl/8.14.185
RootEvidence/1.015
curl/8.5.05
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)4
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/153.0.0.0 Safari/537.364
curl/8.21.02
Pandalytics/2.0 (+https://domainsbot.com/network-crawler-pandalytics-kdc68dhsbd/)2
Go-http-client/1.11
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:150.0) Gecko/20100101 Firefox/150.01
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:145.0) Gecko/20100101 Firefox/145.01

Country

fingerprintco-occurrences
US · United States95
FR · France7
AU · Australia5
SG · Singapore5
DE · Germany4
JP · Japan3
NL · Netherlands2
CA · Canada2
BR · Brazil2
MX · Mexico2

Network (ASN)

fingerprintco-occurrences
AS205016 · HERN Labs AB41
AS63949 · Akamai Connected Cloud27
AS10439 · CariNet, Inc.12
AS16276 · OVH SAS7
AS7922 · Comcast Cable Communications, LLC7
AS20001 · Charter Communications Inc3
AS12989 · Black HOST Ltd3
AS136258 · BrainStorm Network, Inc3
AS218731 · Andris Jakovlevs3
AS16509 · Amazon.com, Inc.2

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.84
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 155.0.8059.40, chrome 156.0.8078.73, chromium 156.0.8078.47, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13.The fingerprint page shows the full measured match list. More on the catalog.1
0a0a,11ec,001d,0017,0018,00191

Cross-transport links

TLS ClientHello fingerprints observed from the same client via the beacon's correlation id on the other transport (e.g. this stack over TCP ↔ that stack over QUIC).

fingerprintlinked observations
q13d0311h3_55b375c5d22e_653d80c3fe9d6