User-Agent

Python-urllib/3.13

first seen 2026-09-05 10:27 · last seen 2026-10-17 06:35 · JSON

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

Browser / clientPython-urllib 3.13
Noteinferred from the self-declared string — a claim, not a measurement; compare with the wire fingerprints above

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
t13d181100_85036bcba153_d41ae481755e2
t13d911200_0d5420ba6086_87b33ccefea82
t13d1813h1_85036bcba153_d339722ba4af1

HTTP request (JA4H)

fingerprintco-occurrences
ge11nn040000_5b1e8b5f4d2d_000000000000_0000000000005

TCP SYN (p0f)

fingerprintco-occurrences
4:49+15:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:115+13:0:1380:mss*47,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:02
4:44+20:0:1300:65535,8:mss,nop,ws,nop,nop,sok:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_72
64860_2-1-3-1-1-4_1380_82
65535_2-1-3-1-1-4_1300_81

Country

fingerprintco-occurrences
BG · Bulgaria2
FR · France2
HK · Hong Kong SAR China1

Network (ASN)

fingerprintco-occurrences
AS16509 · Amazon.com, Inc.2
AS200391 · KREZ 999 EOOD2
AS63888 · DATAWING LIMITED1

TLS supported groups

fingerprintco-occurrences
001d,0017,001e,0019,0018,0100,0101,0102,0103,0104 Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, php-guzzle 8.3.1, curl 7.88.1, +10 more.The fingerprint page shows the full measured match list. More on the catalog.1