TCP SYN (p0f)

4:53+11:0:1380:65535,13:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-01 16:16 · last seen 2026-10-28 03:52 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 34/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 TTL53+11
Options length0
MSS1380
Window size65535
Window scale13
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
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.40
t13d1011h1_61a7ad8aa9b6_3a8073edd8ef39
t13d3013h1_1d37bd780c83_8537cf56674e2
t13d180900_796efca44d18_1497af28dee92
t13d301200_1d37bd780c83_ecd0401ec68b2
t13d4907h2_0d8feac7bc37_7395dae3b2f3 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1511h1_8daaf6152771_78e6aca7449b1

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000037
ge11nr04enus_3adac55f58e9_000000000000_0000000000007
ge11nr11enus_1fab05156ead_000000000000_0000000000004
he11nr04enus_3adac55f58e9_000000000000_0000000000004
he11nr05enus_3bd45b6f184e_000000000000_0000000000004
he11nr13enus_ed40770a2e50_000000000000_0000000000004
ge11nr13enus_ed40770a2e50_000000000000_0000000000003
he11nr06enus_85f58504866d_000000000000_0000000000003
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.2
ge11nn06en00_fb4afd1f380a_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.40
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.1

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1380_1387

User-Agent

fingerprintco-occurrences
curl/8.14.137
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.367
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)6
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.366
Mozilla/5.0 (Macintosh; Intel Mac OS X 14_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Safari/605.1.156
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.05
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)5
Mozilla/5.0 (Linux; Android 14; Pixel 8) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.6422.113 Mobile Safari/537.364
Mozilla/5.0 (compatible; TeardownBriefs/1.0; +https://whop.com/48-hour-teardown)3
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.362

Country

fingerprintco-occurrences
US · United States62
ES · Spain8
CA · Canada4
ZA · South Africa3
BE · Belgium2
CZ · Czechia2
LU · Luxembourg1
MA · Morocco1
KE · Kenya1
CO · Colombia1

Network (ASN)

fingerprintco-occurrences
AS13335 · Cloudflare, Inc.87

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.37
11ec,6399,001d,fe32,0017,0018,00191