TCP SYN (p0f)

4:115+13:0:1460:mss*44,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:0

first seen 2026-06-20 15:57 · last seen 2026-09-14 05:45 · JSON

Last 7 days (7 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 version4
Initial TTL115+13
Options length0
MSS1460
Window sizemss*44
Window scale8
Options layoutmss,nop,ws,nop,nop,sok
Quirksdf,id+,ecn
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
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.6
t13d141100_cbb2034c60b8_e5728521abd45
t13d1312h2_f57a46bbacb6_e5728521abd43
t12d210700_76e208dd3e22_f28add8e7af03
t13d1812h1_85036bcba153_b26ce05bbdd62
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
t13d221000_231e334592e8_29829a46703f1
t13d221100_231e334592e8_36bf25f296df1
t13d1813h1_85036bcba153_d339722ba4af1
t13d191000_9dc949149365_e7c2852226511

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr200000_44e005936497_000000000000_0000000000005
ge20nr12enus_54b4638ab28b_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 150.0.7871.187, chrome 151.0.7922.137, edge 151.0.4129.93, +36 more.The fingerprint page shows the full measured match list. More on the catalog.4
ge20nr030000_0db47b7d240d_000000000000_0000000000003
ge11nn15enus_35372a7bda31_000000000000_0000000000002
ge11nn010000_4a823118b9ba_000000000000_0000000000002
ge11nn07enus_729fbad63700_000000000000_0000000000002
ge20nr13enus_0c2c1d640f3e_000000000000_0000000000001
ge20nn13enus_0c2c1d640f3e_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 151.0.7922.137, chrome 151.0.7922.170, chrome 151.0.7922.108, +23 more.The fingerprint page shows the full measured match list. More on the catalog.1
ge11nr030000_341eb0d8946c_000000000000_0000000000001
ge11nn060000_80ba99a9af22_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
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.3
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, +59 more.The fingerprint page shows the full measured match list. More on the catalog.3
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, +43 more.The fingerprint page shows the full measured match list. More on the catalog.2
1:65536;2:0;4:6291456;6:262144|15663105|3:1:0:220|m,a,s,p Match?Exact match in Thumbprint's published controlled catalog captures: chromium 151.0.7922.34, chromium 147.0.7727.15, chromium 145.0.7632.6, +21 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-1-3-1-1-4_1460_820

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.36 Edg/149.0.0.04
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/149.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.361
Go-http-client/1.11
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.361
python-requests/2.32.51

Country

fingerprintco-occurrences
DE · Germany8
US · United States7
NL · Netherlands3
HK · Hong Kong SAR China2
PL · Poland2
IN · India2
ES · Spain1

Network (ASN)

fingerprintco-occurrences
AS197170 · TechTies Inc.10
AS701 · Verizon Business6
AS140641 · YOTTA NETWORK SERVICES PRIVATE LIMITED2
AS210558 · 1337 Services GmbH1
AS20473 · The Constant Company, LLC1
AS45753 · Netsec Limited1
AS8560 · IONOS SE1
AS153656 · OWGELS INTERNATIONAL CO., LIMITED1
AS49581 · Ferdinand Zink trading as Tube-Hosting1
AS201814 · MEVSPACE sp. z o.o.1

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_653d80c3fe9d4