TCP SYN (p0f)

6:45+19:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:0

first seen 2026-06-27 01:24 · last seen 2026-09-14 07:25 · JSON

Last 7 days (3 observations)

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

IP version6
Initial TTL45+19
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_3550537cd59b357
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
t13d151000_8daaf6152771_18e8a06d9b2d6
t12d290700_fc2078a0b8c0_8c06664c3ac55
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.5
t13d141100_cbb2034c60b8_e5728521abd43
t13d1713h1_ab0a1bf427ad_89ab6efea7732
t13d1312h2_f57a46bbacb6_ab7e3b40a677 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +5 more.The fingerprint page shows the full measured match list. More on the catalog.2
t13d5212h1_b262b3658495_8e6e362c5eac Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.19.0, node-fetch 22.23.1, node-fetch 24.20.0, +5 more.The fingerprint page shows the full measured match list. More on the catalog.1
t13d311100_e8f1e7e78f70_24695f2957a71

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr08enus_002f1ef91713_000000000000_000000000000357
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.7
ge11nr040000_e1d2031bdfea_000000000000_0000000000006
ge11nn06engb_8fb94ea9a91e_000000000000_0000000000003
ge11nn040000_bfa5a9b89dd6_000000000000_0000000000003
ge11nr040000_8391bea91fb6_000000000000_0000000000002
ge11nn050000_ea6f06182064_000000000000_0000000000002
ge11nr040000_9c3956fad5da_000000000000_0000000000001
ge11nn07enus_6c5989145a61_000000000000_0000000000001
ge20nn07enus_3c929cdc62ca_000000000000_0000000000001

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.7
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.8, go-net/http 1.26.7, +6 more.The fingerprint page shows the full measured match list. More on the catalog.2
2:0;4:4194304;5:16384;6:65536|1073741824|0|a,m,p,s1

TCP SYN (JA4T)

fingerprintco-occurrences
64800_2-4-8-1-3_1440_7391

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/537.36357
curl/8.5.07
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.366
Mozilla/5.0 (compatible; MJ12bot/v1.4.8; http://mj12bot.com/)5
Go-http-client/1.13
Mozilla/5.0 (compatible; CT-WP-Scanner/1.0; +https://example.com/bot)2
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.2
DivisionAthenaOfficialFundingNews/0.1 public no-cookie runner2
Mozilla/5.01
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
FR · France361
US · United States11
NL · Netherlands7
GB · United Kingdom6
DE · Germany4
SE · Sweden3
PL · Poland1

Network (ASN)

fingerprintco-occurrences
AS51167 · Contabo GmbH357
AS50219 · Valence Technology Co.6
AS51396 · Pfcloud UG5
AS24940 · Hetzner Online GmbH4
AS16276 · OVH SAS4
AS7922 · Comcast Cable Communications, LLC4
AS39351 · 31173 Services AB3
AS33363 · Charter Communications, Inc3
AS14061 · DigitalOcean, LLC2
AS213230 · Hetzner Online GmbH2