TCP SYN (p0f)

6:46+18:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-25 17:28 · last seen 2026-09-13 16:19 · JSON

Last 7 days (5 observations)

Distinct clients per day (last 30 days, peak 3/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 TTL46+18
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
t13d301000_1d37bd780c83_3550537cd59b351
t12d290700_fc2078a0b8c0_8c06664c3ac549
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.12
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.10
t13d1812h1_85036bcba153_d41ae481755e4
t13d1516h2_8daaf6152771_d8a2da3f94cd Match?Exact match in Thumbprint's published controlled catalog captures: chromium 149.0.7827.102, chrome 149.0.7827.102, chrome 149.0.7827.156, +25 more.The fingerprint page shows the full measured match list. More on the catalog.4
t13d1713h1_ab0a1bf427ad_89ab6efea7733
t13d141100_cbb2034c60b8_e5728521abd42
t13d1617h2_86a278354501_3cbfd9057e0d Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 152.0.3, +10 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d2013h1_2b729b4bf6f3_e24568c0d4402

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr08enus_002f1ef91713_000000000000_000000000000351
ge11nn040000_bfa5a9b89dd6_000000000000_00000000000023
ge11nn030000_dd98166e0881_000000000000_00000000000015
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.12
ge11nn05en00_61812dc1cc58_000000000000_00000000000010
ge11nr040000_8391bea91fb6_000000000000_0000000000004
ge11nn050000_ea6f06182064_000000000000_0000000000003
ge11nr030000_cd680697de12_000000000000_0000000000003
ge11nn030000_fe444ad14866_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.16.0.The fingerprint page shows the full measured match list. More on the catalog.3
ge11nr040000_9c3956fad5da_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.12
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.4
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, +42 more.The fingerprint page shows the full measured match list. More on the catalog.3
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2
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 149.0.7827.102, +58 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:6291456;6:262144;27306:3216358801|15663105|1:1:0:220|m,a,s,p1
1:65536;2:0;4:131072;5:16384|12517377|1:0:0:42|m,p,a,s1
3:100;4:1073741824;2:0|1073676289|0|m,p,s,a1
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, +7 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64800_2-4-8-1-3_1440_7448

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36352
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)49
curl/8.5.011
Go-http-client/1.17
python-httpx/0.28.14
DivisionAthenaOfficialFundingNews/0.1 public no-cookie runner3
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.362
Mozilla/5.0 (compatible; CT-WP-Scanner/1.0; +https://example.com/bot)2
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:152.0) Gecko/20100101 Firefox/152.02
curl/8.21.02

Country

fingerprintco-occurrences
FR · France404
US · United States22
DE · Germany12
NL · Netherlands12
FI · Finland2
SE · Sweden1
HU · Hungary1

Network (ASN)

fingerprintco-occurrences
AS51167 · Contabo GmbH354
AS16276 · OVH SAS51
AS24940 · Hetzner Online GmbH8
AS51396 · Pfcloud UG7
AS33363 · Charter Communications, Inc5
AS7922 · Comcast Cable Communications, LLC4
AS213230 · Hetzner Online GmbH4
AS10796 · Charter Communications Inc3
AS47583 · Hostinger International Limited3
AS211680 · NSEC - Sistemas Informaticos, S.A.2

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_653d80c3fe9d2
q13d0312h3_55b375c5d22e_178839b6cec11