TCP SYN (p0f)

4:118+10:0:1460:62727,7:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-13 01:39 · last seen 2026-09-16 08:03 · JSON

Last 7 days (59 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 TTL118+10
Options length0
MSS1460
Window size62727
Window scale7
Options layoutmss,sok,ts,nop,ws
Quirksdf,id+
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
t13d450900_d524c25c267f_9da38b6fd1bc10496
t13d1011h2_61a7ad8aa9b6_3fcd1a44f3e3 Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.12.28.The fingerprint page shows the full measured match list. More on the catalog.263
t13d3012h1_1d37bd780c83_882d495ac38112
t13d1516h2_8daaf6152771_02713d6af862 Match?Exact match in Thumbprint's published controlled catalog captures: chromium 131.0.6778.33, chromium 134.0.6998.35, chromium 133.0.6943.16.The fingerprint page shows the full measured match list. More on the catalog.4
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.2
t13d301300_1d37bd780c83_5ae85263eb3b2
t13d1713h1_ab0a1bf427ad_ecd0401ec68b 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

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_b47458f13025_000000000000_00000000000010307
ge20nn030000_80b089f68b8e_000000000000_000000000000263
ge11nn030000_0db47b7d240d_000000000000_000000000000121
ge11nn040000_04ca0b4904d5_000000000000_00000000000054
ge11nn040000_47c65c3b1146_000000000000_00000000000014
ge11nn040000_66d37a417839_000000000000_0000000000008
ge11nn040000_c3abebcf3d28_000000000000_0000000000004
ge20nr120000_9c600a72754c_000000000000_0000000000003
ge20nr15enus_cbb1aaa5e388_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 149.0.7827.102, chromium 149.0.7827.102, chrome 149.0.7827.155, +3 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge20nn130000_30dc68305204_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:2097152;5:16384;6:16384|5177345|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: rust-reqwest 0.13.4, rust-reqwest 0.12.28, rust-reqwest 0.13.5, +3 more.The fingerprint page shows the full measured match list. More on the catalog.263
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.4
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
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
62727_2-4-8-1-3_1460_710595

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot) Chrome/119.0.6045.214 Safari/537.3610251
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)263
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/600.2.5 (KHTML, like Gecko) Version/8.0.2 Safari/600.2.5 (Gort)207
Mozilla/5.0 AppleWebKit/605.1.15 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/605.1.1536
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36 Edg/114.0.1823.5112
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.364
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.362
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; YouBot/1.0; +https://docs.you.com/youbot; env:prod) Chrome/142.0.0.0 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/600.2.5 (KHTML, like Gecko) Version/8.0.2 Safari/600.2.5 (Lanai)2
Mozilla/5.0 (Linux; Android 16; SM-S921U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.7632.6 Mobile Safari/537.361

Country

fingerprintco-occurrences
US · United States10781

Network (ASN)

fingerprintco-occurrences
AS14618 · Amazon.com, Inc.10506
AS16509 · Amazon.com, Inc.275

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_5a1f323ef56d3
q13d0311h3_55b375c5d22e_653d80c3fe9d2