davidhbailey.com

HTML metadata

Technology

Server

Apache

Registration

Registrar

IONOS SE

Created

2000-06-20

Expires

2026-06-20 31 days left

Updated

2025-06-21

Name servers

• ns1024.ui-dns.com
• ns1053.ui-dns.de
• ns1084.ui-dns.biz
• ns1097.ui-dns.org

DNS records live

NS

• ns1024.ui-dns.com
• ns1053.ui-dns.de
• ns1084.ui-dns.biz
• ns1097.ui-dns.org

MX

• 10 mx00.ionos.com
• 10 mx01.ionos.com

Email authentication partial

SPF

v=spf1 include:_spf.perfora.net include:_spf-us.ionos.com include:_spf.kundenserver.de ~all

softfail (~all)

DMARC

v=DMARC1; p=none;

policy: none (monitoring only)

DKIM

no key found at common selectors

Certificate (current)

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://davidhbailey.com/

findings

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

Links to (11)

• experimentalmath.info×4
• ams.org×3
• huffingtonpost.com×3
• jonborwein.org×3
• mathinvestor.org×3
• mathscholar.org×3
• sciencemeetsreligion.org×3
• ssrn.com×3
• theconversation.com×3
• acm.org×3
• wikipedia.org×3

Linked from (3)

• maffia.org×4
• mpfr.org×2
• experimentalmath.info×2