Public-Key-Pins

HTTP response header

The HTTP Public-Key-Pins response header associates a specific cryptographic public key with a certain web server to decrease the risk of MITM attacks with forged certificates. If one or several keys are pinned and none of them are used by the server the browser will not accept the response as legitimate and will not display it.

Header usage statistics

Public-Key-Pins response header information and usage statistics.
Websites using header Public-Key-Pins15,068
Percentage of websites that use Public-Key-Pins header<0.1%
Total discovered header values2,389
Header uses directivesYes
Header values are unique or randomNo
Most popular in the country United States

Public-Key-Pins directives (4 total)

  • includesubdomains
  • max-age
  • pin-sha256
  • report-uri

Public-Key-Pins Directives

Public-Key-Pins directives value information and usage statistics
DirectiveShareWebsites countUnique Values
pin-sha25690.20%13,592135
max-age85.52%12,88628
includesubdomains77.79%11,72226
report-uri5.67%85415

Public-Key-Pins header usage distribution by website rank



Geographical Distribution

Header usage distribution by websites across the globe.



Websites utilizing Public-Key-Pins

List of websites that use Public-Key-Pins header
DomainCountryRankContacts
validator.w3.org United States265
addons.mozilla.org United States779
www.barnesandnoble.com United States1,129
www.bip.gov.pl Poland3,390
www.gsa.gov United States4,641
www.codeproject.com Canada6,896
See full domain list

Common header values

List of top common Public-Key-Pins header values
Header valueValue prevalence
pin-sha256="X3pGTSOuJeEVw989IJ/cEtXUEmy52zs1TZQrU06KUKg=" max-age=15552000; includeSubDomains12.38%
pin-sha256="base64+primary=="; pin-sha256="base64+backup=="; max-age=5184000; includeSubDomains12.01%
: pin-sha256="wGeuZWpwDHgQqGjow+N/PhsxUeTq+cS694SDmD0MVtA="; max-age=31536000; includeSubDomains6.88%
pin-sha256='X3pGTSOuJeEVw989IJ/cEtXUEmy52zs1TZQrU06KUKg='; pin-sha256='MHJYVThihUrJcxW6wcqyOISTXIsInsdj3xK8QrZbHec='; pin-sha256='isi41AizREkLvvft0IRW4u3XMFR2Yg7bvrF7padyCJg='; includeSubdomains; max-age=25920005.39%
pin-sha256="wGeuZWpwDHgQqGjow+N/PhsxUeTq+cS694SDmD0MVtA="; max-age=31536000; includeSubDomains4.83%
pin-sha256="<Subject Public Key Information (SPKI)>"; max-age=2592000; includeSubDomains3.69%
pin-sha256=""; pin-sha256=""; max-age=315360002.65%
pin-sha256="klO23nT2ehFDXCfx3eHTDRESMz3asj1muO+4aIdjiuY="; pin-sha256="633lt352PKRXbOwf4xSEa1M517scpD3l5f79xMD9r9Q="; max-age=2592000; includeSubDomains1.89%
: pin-sha256="nC/WIfAk/MVYCA+pbEP5A5F70YopIaoLs+mo1oMtcUo="; max-age=31536000; includeSubDomains1.20%
pin-sha256="base64+info1="; max-age=315360001.00%
pin-sha256='X3pGTSOuJeEVw989IJ/cEtXUEmy52zs1TZQrU06KUKg=';0.79%
pin-sha256="S1CQF4bfrfu+0NZpDAVgczOJu73tqMTakCcdDM6il1E="; pin-sha256="7V0k+NyeVRIXOmD+zCJpX6nsXdAFjX0MsIACD/NeTQg="; max-age=2592000; includeSubDomains0.77%
pin-sha256="Slt48iBVTjuRQJTjbzopminRrHSGtndY0/sj0lFf9Qk="; pin-sha256="klO23nT2ehFDXCfx3eHTDRESMz3asj1muO+4aIdjiuY="; max-age=60; includeSubDomains0.70%
pin-sha256="aR6DUqN8qK4HQGhBpcDLVnkRAvOHH1behpQUU1Xl7fE="; max-age=2592000; includeSubDomains0.63%
pin-sha256=\"base64+primary==\"; pin-sha256=\"base64+backup==\"; max-age=5184000; includeSubDomains0.61%
pin-sha256="C5+lpZ7tcVwmwQIMcRtPbsQtWLABXhQzejna0wHFr8M="; pin-sha256="diGVwiVYbubAI3RW4hB9xU8e/CH2GnkuvVFZE8zmgzI="; max-age=5184000; includeSubDomains0.57%
pin-sha256="pin1"; pin-sha256="pin2"; max-age=25920000.46%
pin-sha256="jDNPIoQdviZhELycQEXvXmBzJFLLM13xUlT8Jamgc0U="; pin-sha256="KVhT/NkSwnjmxDOvcy6MKwG9ak5RAgxEOV0QQBT94Bo="; pin-sha256="5kJvNEMw0KjrCAu7eXY5HZdvyCS13BbA0VJG1RSP91w="; pin-sha256="r/mIkG3eEpVdm+u/ko/cwxzOMo1bk4TyHIlByibiA5E="; report-uri="https:/0.45%
max-age=2592000;pin-sha256="GRAH5Ex+kB4cCQi5gMU82urf+6kEgbVtzfCSkw55AGk=";pin-sha256="Dh46PQn5HIpXCusEb8G7YJsLzBSGAzNjgvsxeShjlv8="0.42%
pin-sha256="PQfjTZ6Zwh1l5TpMkjOF85NBLH05yCD0Q4U6IuH17x0="; pin-sha256="vJ6JGRfCsYINcfiUwxxg4vmkhmQOTi3jksgxCavebo8="; pin-sha256="lnsM2T/O9/J84sJFdnrpsFp3awZJ+ZZbYpCWhGloaHI="; includeSubDomains; max-age=51840000;0.37%