TCP SYN (JA4T)

42600_2-4-8-1-3_1420_9

first seen 2026-07-02 03:07 · last seen 2026-09-15 20:46 · JSON

Decomposed attributes

TCP window42600
Option kinds2-4-8-1-3
MSS1420
Window scale9

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
t13d131200_f57a46bbacb6_9249cab70c771460
t13d131300_f57a46bbacb6_1bd98dace775409
t13d190900_9dc949149365_97f8aa674fd91
t13d1910h2_9dc949149365_97f8aa674fd91

HTTP request (JA4H)

fingerprintco-occurrences
ge11nr05enus_f3bb7aa45ec4_000000000000_0000000000001314
ge11nn05enus_f3bb7aa45ec4_000000000000_000000000000356
ge11nr060000_6f1c3d56a901_000000000000_00000000000099
ge11nr040000_e1d2031bdfea_000000000000_00000000000047
ge11nr030000_cd680697de12_000000000000_00000000000016
ge11nn040000_e1d2031bdfea_000000000000_00000000000016
ge11nn060000_6f1c3d56a901_000000000000_00000000000015
po11nr070000_5de413af0b17_000000000000_0000000000002
po11nr090000_0c3f6181eb51_000000000000_0000000000002
he20nn010000_a510e5066512_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
2:0;4:4194304;6:10485760|1073741824|0|a,m,p,s Match?Exact match in Thumbprint's published controlled catalog captures: go-net/http 1.21.13, go-net/http 1.23.12.The fingerprint page shows the full measured match list. More on the catalog.1

TCP SYN (p0f)

fingerprintco-occurrences
4:58+6:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:01786
4:55+9:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:027
4:51+13:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:025
4:49+15:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:013
4:57+7:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:013
4:50+14:0:1420:mss*30,9:mss,sok,ts,nop,ws:df,id+:07

User-Agent

fingerprintco-occurrences
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ChatGPT-User/1.0; +https://openai.com/bot)35
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GPTBot/1.4; +https://openai.com/gptbot)24
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)24
Mozilla/5.0 (compatible; PerplexityBot/1.0; +https://perplexity.ai/perplexitybot)23
Mozilla/5.0 (compatible; Perplexity-User/1.0; +https://perplexity.ai/perplexity-user)22
Mozilla/5.0 (compatible; Amazonbot/0.1; +https://developer.amazon.com/support/amazonbot)21
Mozilla/5.0 (compatible; Google-Extended/1.0; +http://www.google.com/bot.html)20
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; TelegramBot/1.0)20
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; GrokBot/1.0; +https://x.ai/grokbot)19
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; Claude-User/1.0; +https://www.anthropic.com/claude-user)19

Country

fingerprintco-occurrences
US · United States775
BE · Belgium475
TW · Taiwan274
NL · Netherlands150
JP · Japan138
SG · Singapore59

Network (ASN)

fingerprintco-occurrences
AS396982 · Google LLC1871