siwu.io

.io crawl

First seen 2026-04-13 · Last seen 2026-05-03 · ok HTTP/1.1 200 800 ms crawled 2026-05-07

US · 185.199.110.153 · AS54113 Fastly, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: Si Wu Personal Website
Language: en

Technology

CDN: Fastly
Server: GitHub.com

Third-party hosts loaded (1)

code.jquery.com×1

Social

DNS records live

NS

ns-cloud-c1.googledomains.com
ns-cloud-c2.googledomains.com
ns-cloud-c3.googledomains.com
ns-cloud-c4.googledomains.com

MX

10 mxa.mailgun.org
10 mxb.mailgun.org

Email authentication partial

SPF

v=spf1 include:mailgun.org ~all

softfail (~all)

DMARC

not published

DKIM

k1: k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDimBqBnXS/AP8G5dqsybF/ou7pLLEwgOPQoL9AIsjqzQ8yKMMS0JJkI94EI4fqMrok010H1UW8bkAb9HPhVPm74KMnjYy…

selectors probed

Certificate (current)

R12

from 2026-04-21 to 2026-07-20

Expires in 62 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://siwu.io/

findings

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

Links to (6)

Linked from (1)

jonbarron.info×2