TCP SYN (p0f)

4:45+19:0:1400:65535,10:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-07-20 01:06 · last seen 2026-10-30 01:22 · JSON

Last 7 days (8 observations)

Distinct clients per day (last 30 days, peak 4/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 TTL45+19
Options length0
MSS1400
Window size65535
Window scale10
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
t13d4412h1_fd39b124ee10_58ed7828516f21
t13d1515h1_8daaf6152771_de4a06bb82e310
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.6
t13d1515h1_8daaf6152771_0a20fe35d3a53
t13d1516h1_8daaf6152771_1a63afa7c4781

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn050000_b223a0ebb0b5_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.34.2, python-requests 2.33.1, python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.21
ge11nn13enus_9db22d02e17a_000000000000_00000000000011
ge11nn14enus_4a2973d235de_000000000000_0000000000003
ge11nr16enus_3dfdba18536b_000000000000_0000000000002
ge11nr16zhtw_4723467df157_000000000000_0000000000001
ge11nr18zhcn_45ed06ef2081_000000000000_0000000000001
ge11nr16engb_3dfdba18536b_000000000000_0000000000001
ge11nr17zhcn_021c223ca66c_000000000000_0000000000001

TCP SYN (JA4T)

fingerprintco-occurrences
65535_2-4-8-1-3_1400_1041

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.363
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.75 Safari/537.362
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.362
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
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.361
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.151
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.361
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:126.0) Gecko/20100101 Firefox/126.01

Country

fingerprintco-occurrences
ZA · South Africa23
NG · Nigeria7
BD · Bangladesh3
KE · Kenya2
ET · Ethiopia2
DZ · Algeria1
OM · Oman1
MU · Mauritius1
BW · Botswana1

Network (ASN)

fingerprintco-occurrences
AS37105 · RAIN GROUP HOLDINGS (PTY) LTD19
AS12091 · MTN SA4
AS29465 · MTN NIGERIA Communication limited4
AS36873 · Airtel Networks Limited3
AS33771 · Safaricom Limited2
AS24757 · Ethio Telecom2
AS24432 · TM International Bangladesh Ltd.Internet service Provider,Gulshan-1,Dhaka-12122
AS36947 · Telecom Algeria1
AS28885 · OmanTel NAP1
AS30999 · EMTEL LIMITED1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: firefox 158.0.1, firefox 157.0, firefox 157.0.1, +5 more.The fingerprint page shows the full measured match list. More on the catalog.6
0a0a,001d,0017,00182
0a0a,11ec,001d,0017,0018 Match?Exact match in Thumbprint's published controlled catalog captures: chrome 156.0.8078.48, edge 155.0.4283.62, chrome 156.0.8078.47, +11 more.The fingerprint page shows the full measured match list. More on the catalog.1