adventofcode.com

.com crawl

First seen 2026-04-11 · Last seen 2026-05-19 · ok HTTP/1.1 200 1945 ms crawled 2026-05-18

US · 52.7.118.97 · AS14618 Amazon.com, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: Advent of Code 2025
Language: en-us

Technology

Server: Apache
CMS: Gatsby

Registration

Registrar

Amazon Registrar, Inc.

Created

2015-10-21

Expires

2026-10-21 154 days left

Updated

2026-05-14

Name servers

ns-1224.awsdns-25.org
ns-1639.awsdns-12.co.uk
ns-218.awsdns-27.com
ns-784.awsdns-34.net

DNS records live

NS

ns-1224.awsdns-25.org
ns-1639.awsdns-12.co.uk
ns-218.awsdns-27.com
ns-784.awsdns-34.net

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

google-site-verification=RJGYnnqDnB6LabX1RR8Ppej3EY43mqp81mzpK7LJEjM
google-site-verification=nnihjRJnNchIrA4PzKdgLDCzYyL6Vy1nhtfh8b3HTRc

Email authentication weak

SPF

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

softfail (~all)

DMARC

not published

DKIM

google: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA4Tc5oOUsh8S2Of3B4qYsUxU40BWW/Bn4565qSQ1wbPzp5I9INjri3TYR27vUlXy99WdC+YGqSVzsoG…

selectors probed

Certificate (current)

Amazon RSA 2048 M01

from 2026-03-01 to 2026-09-15

Expires in 118 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 45/100 Checked live page: https://adventofcode.com/

present

strict-transport-security

findings

short HSTS max-age
missing Content Security Policy
missing frame protection
missing content type protection
missing Referrer Policy
missing Permissions Policy

Header values

strict-transport-security: max-age=300