joincheckmate.com

.com crawl

First seen 2026-05-02 · Last seen 2026-05-15 · ok HTTP/1.1 200 6221 ms crawled 2026-05-09

US · 104.18.23.235 · AS13335 Cloudflare, Inc.

Reputation 100/100

Classifying

HTML metadata

Title: Checkmate
Description: Checkmate is a browser extension that automatically finds and applies Online coupon codes, discounted gift cards and coupons from your inbox with a single click. Automatically apply coupons, gift cards and more.
Language: en

Open Graph

title: Checkmate
description: Be rewarded for who you are.

Technology

CDN: Cloudflare
CMS: Shopify

Third-party hosts loaded (2)

www.facebook.com×2
px.ads.linkedin.com×1

Social

Contact

Email

support@joincheckmate.com

Registration

Registrar

Cloudflare, Inc.

Created

2020-07-28

Expires

2026-07-28 69 days left

Updated

2022-09-21

Name servers

chad.ns.cloudflare.com
teresa.ns.cloudflare.com

DNS records live

NS

chad.ns.cloudflare.com
teresa.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

MS=7E13930C73D0C845960F5180C2A6A906669B2BCE
klaviyo-site-verification=QNYLEa

Verified for

Apple
Google
Microsoft 365

Email authentication strong

SPF

v=spf1 include:_spf.google.com include:mail.zendesk.com include:_spf.mx.cloudflare.net include:relay.mailchannels.net include:20687929.spf02.hubspotemail.net ~all

softfail (~all)

DMARC

v=DMARC1; p=reject; rua=mailto:7b0725d842c14989ac4eaa04bdfcda0e@dmarc-reports.cloudflare.net

policy: reject (enforced)

DKIM

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

selectors probed

Certificate (current)

from 2026-05-09 to 2026-08-07

Expires in 79 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 95/100 Checked live page: https://joincheckmate.com/

present

strict-transport-security
content-security-policy
x-frame-options
x-content-type-options
referrer-policy
cross-origin-opener-policy
cross-origin-embedder-policy
cross-origin-resource-policy

findings

missing Permissions Policy

Header values

referrer-policy: strict-origin-when-cross-origin
x-frame-options: DENY
x-content-type-options: nosniff
content-security-policy: frame-ancestors 'none'
strict-transport-security: max-age=15552000; includeSubDomains
cross-origin-opener-policy: same-site; report-to="default";
cross-origin-embedder-policy: require-corp; report-to="default";
cross-origin-resource-policy: same-site