User-Agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko); compatible; ChatGPT-User/1.0; +https://openai.com/bot

first seen 2026-06-12 09:38 · last seen 2026-11-01 03:27 · JSON

Last 7 days (64 observations)

Distinct clients per day (last 30 days, peak 16/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 / clientChatGPT-User 1.0
Device classbot
Declared URLhttps://openai.com/bot
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
t13d1712h2_5b57614c22b0_ef7df7f74e48347
t13d1713h2_5b57614c22b0_02c8e53ee398231
t13d1712h2_5b57614c22b0_d5fe2c511efa105
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.23
t13d131200_f57a46bbacb6_9249cab70c7712
t13d131300_f57a46bbacb6_1bd98dace7757

HTTP request (JA4H)

fingerprintco-occurrences
ge20nn06enus_32386ca2063f_000000000000_000000000000617
ge20nn07enus_bba0b359f971_000000000000_00000000000066
ge11nr05enus_f3bb7aa45ec4_000000000000_00000000000010
ge20nr050000_857b5fa3405d_000000000000_0000000000006
ge20nr050000_7e80a5f53adf_000000000000_0000000000004
ge20nr050000_bb384e635ab6_000000000000_0000000000004
ge11nn05enus_f3bb7aa45ec4_000000000000_0000000000003
ge11nr060000_6f1c3d56a901_000000000000_0000000000003
ge20nr050000_277e78b0d503_000000000000_0000000000003
ge20nn050000_bb384e635ab6_000000000000_0000000000002

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;1:4096;8:0;3:1024;4:1048576|25100289|0|a,p,m,s683
2:0;4:4194304;5:16384;6:262144;1:65536|1073741824|0|a,m,p,s22
2:0;4:4194304;5:16384;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.26.6, go-net/http 1.26.10, go-net/http 1.26.9, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:44+20:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:081
4:39+25:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:072
4:48+16:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:072
4:49+15:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:071
4:38+26:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:063
4:43+21:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:050
4:40+24:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:046
4:47+17:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:044
4:42+22:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:043
4:45+19:0:1418:mss*44,9:mss,sok,ts,nop,ws:df,id+:039

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1418_9607
65320_2-4-8-1-3_1420_1023
42600_2-4-8-1-3_1420_918
64860_2-4-8-1-3_1368_93
43200_2-4-8-1-3_1440_91

Country

fingerprintco-occurrences
US · United States195
AU · Australia56
JP · Japan52
DK · Denmark48
CH · Switzerland46
PL · Poland43
NZ · New Zealand36
DE · Germany34
BE · Belgium34
KR · South Korea31

Network (ASN)

fingerprintco-occurrences
AS8075 · Microsoft Corporation683
AS396982 · Google LLC41
AS206216 · Advin Services LLC1

TLS supported groups

fingerprintco-occurrences
001d,0017,0018,0019 Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, curl 8.7.1.The fingerprint page shows the full measured match list. More on the catalog.131
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.19