TCP SYN (p0f)

4:47+17:0:1460:mss*29,9:mss,sok,ts,nop,ws:df,id+:0

first seen 2026-06-27 18:04 · last seen 2026-10-28 07:27 · JSON

Last 7 days (1 observations)

Distinct clients per day (last 30 days, peak 80/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 TTL47+17
Options length0
MSS1460
Window sizemss*29
Window scale9
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_8537cf56674e85
t13d191000_9dc949149365_e7c28522265117
t13d521100_b262b3658495_8e6e362c5eac3
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
t13d301000_1d37bd780c83_3550537cd59b1
t13d1714h1_5b57614c22b0_43ade6aba3df1
t13d311200_1d947a95fc68_7e1102d2036b Match?Exact match in Thumbprint's published controlled catalog captures: java-urlconnection 17.0.19.The fingerprint page shows the full measured match list. More on the catalog.1
t13d1512h2_8daaf6152771_cbb9361b6bf91
t13d0810h2_946f3542e247_5603904660151
t13d1011h2_a668d5841b34_9ced094328c91

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn030000_bf75ddd0bb29_000000000000_00000000000085
ge11nn05zh00_4ee89fec50ea_000000000000_00000000000010
ge11nn05zh00_ddc401472a00_000000000000_0000000000005
ge20nn04enus_989c7cc05c9b_000000000000_0000000000003
ge11nn050000_b9f979e9b0b7_000000000000_0000000000002
ge11nr06enus_a89d28968959_000000000000_0000000000002
ge11nn07enus_71b742b5154a_000000000000_0000000000002
ge11nn06enus_829a35c9de3b_000000000000_0000000000001
ge11nr05en00_978ba9f30f5e_000000000000_0000000000001
ge11nn08enus_0e9bd3873e9d_000000000000_0000000000001

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.85
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p3

TCP SYN (JA4T)

fingerprintco-occurrences
42340_2-4-8-1-3_1460_9111

User-Agent

fingerprintco-occurrences
curl/8.14.185
Mozilla/5.0 (Linux; Android 11; vivo 1906; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/87.0.4280.141 Mobile Safari/537.36 VivoBrowser/8.9.0.07
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.365
curl/7.4.05
Mozilla/5.0 (compatible; The Lounge IRC Client; +https://github.com/thelounge/thelounge) facebookexternalhit/1.1 Twitterbot/1.03
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.362
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.361
Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Mobile/15E148 Safari/604.11
Protopage/3.0 (http://www.protopage.com)1
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.1 Safari/537.36 Edg/134.0.0.11

Country

fingerprintco-occurrences
DE · Germany85
CN · China17
NL · Netherlands5
CA · Canada2
HK · Hong Kong SAR China2
FR · France2

Network (ASN)

fingerprintco-occurrences
AS14061 · DigitalOcean, LLC85
AS4134 · CHINANET BACKBONE17
AS61125 · SABOTAGE LLC3
AS211443 · SINO WORLDWIDE TRADING LIMITED2
AS3215 · Orange S.A.2
AS16276 · OVH SAS1
AS138997 · Eons Data Communications Limited1
AS23764 · CTGNet1
AS22423 · Altima Telecom1

TLS supported groups

fingerprintco-occurrences
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: node-fetch 24.22.1, python-httpx 0.28.1, python-requests 2.34.2, +2 more.The fingerprint page shows the full measured match list. More on the catalog.86