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SPECTER
fingerprint test
Network fingerprint analysis
Your fingerprint. Every field, every layer.
This page captured your TCP/IP, TLS, and HTTP/2 fingerprint from a single connection and compared it against Chrome on Windows 11 — the most common profile on the internet.
4/25
fields matching Chrome / Windows 11
Exposed. Your fingerprint bears little resemblance to the target profile. Any passive observer can trivially identify your OS, browser, and likely your specific software stack.
[ fields ]
Field-by-field comparison
TCP / IP
✗
TTL
(unavailable — requires Linux)
128
IP Time To Live — the most important single OS fingerprint field
✗
DF Bit
(unavailable — requires Linux)
true
Don't Fragment flag in IP header
✗
Window Size
(unavailable — requires Linux)
64240
TCP initial window size in SYN packet
✗
Window Scale
(unavailable — requires Linux)
8
TCP window scaling factor
✗
MSS
(unavailable — requires Linux)
1460
Maximum Segment Size
✗
Options Order
(unavailable — requires Linux)
mss, nop, ws, nop, nop, sack_perm
Order of TCP options in SYN packet
✗
Timestamps
(unavailable — requires Linux)
false
TCP timestamp option presence — binary OS classifier
✗
SACK
(unavailable — requires Linux)
true
Selective Acknowledgment support
✗
ECN
(unavailable — requires Linux)
false
Explicit Congestion Notification
TLS
✓
TLS Version
TLS 1.3
TLS 1.3
Maximum TLS version offered — Chrome uses TLS 1.3.
✓
Cipher Count
10
15 (typical)
Number of cipher suites offered — Chrome offers ~15, minimal TLS stacks offer far fewer.
✓
TLS 1.3 Ciphers
true
true
Whether TLS 1.3 cipher suites (0x1301-0x1303) are offered.
✓
ALPN h2
true
true
Whether HTTP/2 is advertised via ALPN — Chrome always offers h2.
✗
GREASE
false
true
GREASE (RFC 8701) — Chrome inserts random GREASE values, absence reveals non-browser clients.
✗
Compress Certificate
false
true
Certificate compression extension — Chrome supports Brotli certificate compression.
✗
Extension Count
11
15-20 (typical)
Number of TLS extensions — too few or too many reveals the TLS library.
✗
JA3
bb44396f3c186bb625158d41633e1e78
(browser-specific)
JA3 hash — MD5 of version, ciphers, extensions, curves, point formats.
✗
JA4
t13d1010h2_61a7ad8aa9b6_8578f008a1b0
(browser-specific)
JA4 fingerprint — modern TLS fingerprint with sorted ciphers and SHA-256.
HTTP/2
✗
H2 Settings Order
2, 4, 5, 6
1, 3, 4, 6
Order of HTTP/2 SETTINGS parameters — each implementation sends a characteristic sequence.
✗
H2 ENABLE_PUSH
0
varies
HTTP/2 ENABLE_PUSH value — implementation-specific default.
✗
H2 INITIAL_WINDOW_SIZE
2097152
6291456
HTTP/2 INITIAL_WINDOW_SIZE value — implementation-specific default.
✗
H2 MAX_FRAME_SIZE
16384
varies
HTTP/2 MAX_FRAME_SIZE value — implementation-specific default.
✗
H2 MAX_HEADER_LIST_SIZE
16384
262144
HTTP/2 MAX_HEADER_LIST_SIZE value — implementation-specific default.
✗
H2 Window Update
5177345
15663105
HTTP/2 initial WINDOW_UPDATE on stream 0 — Chrome sends 15663105.
✗
H2 Pseudo-Header Order
:method, :scheme, :authority, :path
:method, :authority, :scheme, :path
Order of HTTP/2 pseudo-headers — Chrome uses :method, :authority, :scheme, :path.
[ raw ]
Raw TLS fingerprint
JA3bb44396f3c186bb625158d41633e1e78
JA4t13d1010h2_61a7ad8aa9b6_8578f008a1b0
Ciphers0x1302, 0x1301, 0x1303, 0xC02C, 0xC02B, 0xCCA9, 0xC030, 0xC02F, 0xCCA8, 0x00FF
Extensions0x0017, 0x000D, 0x0033, 0x0005, 0x0000, 0x0023, 0x002B, 0x0010, 0x000B, 0x000A, 0x002D
ALPNh2, http/1.1
[ privacy ]
No data stored. Ever.
This test runs entirely in memory. No database, no disk writes, no IP logging, no cookies, no analytics, no external resources. Your fingerprint data was deleted the moment this page was rendered.