Network (ASN)

AS40021

first seen 2026-06-11 16:01 · last seen 2026-11-01 02:27 · JSON

Last 7 days (76 observations)

Distinct clients per day (last 30 days, peak 10/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

Network nameContabo Inc.
Domaincontabo.com

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
t13d751100_479067518aa3_d41ae481755e154
t13i170900_5b57614c22b0_78e6aca7449b7
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.7
t13d1812h1_85036bcba153_d41ae481755e6
t13d3112h1_e8f1e7e78f70_b26ce05bbdd6 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.2.0, php-guzzle 8.1.0, php-guzzle 8.3.1, +12 more.The fingerprint page shows the full measured match list. More on the catalog.5
t13d8712h1_c66346c74e42_24695f2957a73
t12d190800_d83cc789557e_16bbda4055b22
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.1
t13d4312h1_c7886603b240_b26ce05bbdd61
t13d1713h1_ab0a1bf427ad_ecd0401ec68b Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1.The fingerprint page shows the full measured match list. More on the catalog.1

HTTP request (JA4H)

fingerprintco-occurrences
ge10nn020000_d5c75abc5c2c_000000000000_000000000000154
ge20nn030000_bf75ddd0bb29_000000000000_0000000000007
ge11nn060000_9a9581e5be92_000000000000_0000000000006
ge11nn040000_608e01151bf4_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: python-requests 2.32.3.The fingerprint page shows the full measured match list. More on the catalog.3
he11nn020000_818f42cc3fd7_000000000000_0000000000003
ge11nn020000_818f42cc3fd7_000000000000_000000000000 Match?Exact match in Thumbprint's published controlled catalog captures: php-guzzle 8.2.0, php-guzzle 8.1.0, php-guzzle 8.3.1, +13 more.The fingerprint page shows the full measured match list. More on the catalog.2
ge11nn050000_be0d0b335e46_000000000000_0000000000002
ge11nn040000_cabeb744284e_000000000000_0000000000002
ge11nn070000_f395b2c4bb38_000000000000_0000000000002
ge11nn050000_e81ae831f766_000000000000_0000000000002

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.7
1:65536;2:0;4:6291456;6:262144;4:1048576|15663105|1:0:0:256|m,a,s,p1

TCP SYN (p0f)

fingerprintco-occurrences
4:55+9:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:0158
6:56+8:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:06
6:53+11:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:05
4:49+15:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:04
6:52+12:0:1440:mss*45,7:mss,sok,ts,nop,ws:flow:04
4:119+9:0:1460:65535,8:mss,nop,ws,nop,nop,sok:df,id+,ecn:03
4:53+11:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:56+8:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:02
4:52+12:0:1460:mss*44,7:mss,sok,ts,nop,ws:df,id+:01
4:52+12:0:1460:mss*44,10:mss,sok,ts,nop,ws:df,id+:01

TCP SYN (JA4T)

fingerprintco-occurrences
64240_2-4-8-1-3_1460_7165
64800_2-4-8-1-3_1440_717
65535_2-1-3-1-1-4_1460_83
42340_2-4-8-1-3_1460_121

User-Agent

fingerprintco-occurrences
libredtail-http7
curl/8.14.17
TheMapBot/0.1 (SaaS product enumeration research; +mailto:henryfried67@gmail.com)6
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.363
Stumpy/1.0 (link checker)3
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.362
Mozilla/5.01
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 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.361

Country

fingerprintco-occurrences
US · United States190

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.159
11ec,001d,0017,001e,0018,0019,0100,0101 Match?Exact match in Thumbprint's published controlled catalog captures: python-httpx 0.28.1, python-requests 2.34.2, curl 8.23.0, +4 more.The fingerprint page shows the full measured match list. More on the catalog.7
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.6