killercoda.com

.com crawl

First seen 2026-04-13 · Last seen 2026-05-14 · ok HTTP/1.1 200 634 ms crawled 2026-05-06

US · 104.26.14.111 · AS13335 Cloudflare, Inc.

Reputation 100/100

Classifying

HTML metadata

Title: Killercoda Interactive Environments
Description: Learn DevOps Linux Kubernetes CKS CKA CKAD Git Linux Programming
Language: en

Open Graph

title: Killercoda Interactive Environments
description: Learn DevOps Linux Kubernetes CKS CKA CKAD Git Linux Programming

Technology

CDN: Cloudflare

Registration

Registrar

NameCheap, Inc.

Created

2021-02-08

Expires

2027-02-08 264 days left

Updated

2026-01-09

Name servers

jermaine.ns.cloudflare.com
mariah.ns.cloudflare.com

DNS records live

NS

jermaine.ns.cloudflare.com
mariah.ns.cloudflare.com

MX

10 mail.protonmail.ch
20 mailsec.protonmail.ch

TXT

google-site-verification=ZzLdXecoIgcXb9iX-7hAy4rFY7Nvfat8hKtlO6MTsUo
protonmail-verification=8fe78dc7ecfa91dc3fc5edd3dcbc0bb66842ede8

Email authentication strong

SPF

v=spf1 include:_spf.protonmail.ch mx ~all

softfail (~all)

DMARC

v=DMARC1; p=quarantine

policy: quarantine

DKIM

s1: k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAuhu5ML3vQ0lLGOxDaUpP4+Nvtwh9iqfygZyFwy3lbN/x7BKuRTf8URyXdkElgZFpdVn3wuCw4A7ayc767Q…
s2: k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC6Tl1i12WWATQPSVTzsmDjhibTkwP9JIpRIksWZB7I/Tsb9EY4vsqVIz4ZEFNvLn6G4c7EFIaKE9EcEP19dagA29…

selectors probed

Certificate (current)

WE1

from 2026-05-03 to 2026-08-01

Expires in 74 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 85/100 Checked live page: https://killercoda.com/

present

strict-transport-security
content-security-policy
x-frame-options
x-content-type-options

findings

short HSTS max-age
missing Referrer Policy
missing Permissions Policy

Header values

x-frame-options: DENY
x-content-type-options: nosniff
content-security-policy: frame-ancestors 'none'
strict-transport-security: max-age=2592000; includeSubDomains; preload