cyfrin.io

.io crawl

First seen 2026-04-14 · Last seen 2026-05-12 · ok HTTP/1.1 200 374 ms crawled 2026-05-08

US · 198.202.211.1 · AS209242 Cloudflare London, LLC

Reputation 94/100 dmarc monitor-only

sector tech type homepage

HTML metadata

Title: Blockchain Security, Smart Contract Audits, Developer Education - Cyfrin
Description: Cyfrin is a Blockchain Security Platform. We make protocols safer with leading Smart Contract Security Audits, Blockchain Developer Courses, and Security Research.
Language: en

Open Graph

title: Blockchain Security, Smart Contract Audits, Developer Education - Cyfrin
description: Cyfrin is a Blockchain Security Platform. We make protocols safer with leading Smart Contract Security Audits, Blockchain Developer Courses, and Security Research.

Technology

CDN: Cloudflare

Fonts

Google Fonts

Third-party hosts loaded (6)

cdn.prod.website-files.com×143
ajax.googleapis.com×1
d3e54v103j8qbb.cloudfront.net×1
fonts.googleapis.com×1
fonts.gstatic.com×1
rwj69h.csb.app×1

Social

DNS records live

NS

jakub.ns.cloudflare.com
meiling.ns.cloudflare.com

MX

1 aspmx.l.google.com
10 alt3.aspmx.l.google.com
10 alt4.aspmx.l.google.com
5 alt1.aspmx.l.google.com
5 alt2.aspmx.l.google.com

TXT

5a12505d-577f-4b3c-8864-0639c62b56d3=9ae7780d8f0974608f4b016b38cb54803a6f0431eb37faafb3aff2c61ecde891
815bac34-ddb4-4d58-af27-920cc01bd4f6=d0c525a042a2551a46caaf200b6d0570f641eaca9e52b95d987a07c992f4d807
ahrefs-site-verification_e6d5e6a9b53809902f7b6bbd54ddb55d76c6c184fa72d73f102c59844695700c

Email authentication partial

SPF

v=spf1 include:_spf.google.com ~all

softfail (~all)

DMARC

v=DMARC1; p=none;

policy: none (monitoring only)

DKIM

google: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAjcwZlXewFnMQny262s8EZLIsqwhZqq5nA3saD9KCeTNU7FMWtrPZDxRiuNwHLwklgiBKhUV37fXq3G…
k2: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv2aC2KjGKLOwTweBY5A9RpjsxaBXR9r7OAU6U8/zn92ivImI75naUujWbItRI/QmL1jy5PWGqLwoUA…

selectors probed

Certificate (current)

WE1

from 2026-04-27 to 2026-07-26

Expires in 67 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://www.cyfrin.io/

present

strict-transport-security

findings

missing Content Security Policy
missing frame protection
missing content type protection
missing Referrer Policy
missing Permissions Policy

Header values

strict-transport-security: max-age=31536000