indexo.dev

a1.nl

.nl dns crawl

First seen 2026-05-21 · Last seen 2026-06-04 · ok HTTP/1.1 200 1906 ms crawled 2026-05-27

NL · 217.77.156.113 · AS12902 Ekco B.V.

Reputation 100/100

Classifying

HTML metadata

Title
A1 Internet
Language
nl

Open Graph

url
https://www.a1.nl
title
A1 Internet
locale
nl
site name
A1 Internet

Technology

Server
nginx
Analytics
  • Google Tag Manager

Third-party hosts loaded (2)

  • static.zdassets.com×1
  • www.googletagmanager.com×1

Social

Contact

Email
Phone
Address
A1 InternetAbelenstra Boulevard 52-108448 JB HeerenveenTelefoonnummer: 0513 646 493E-mailadres:info@a1.nl

DNS records live

NS
  • ns01.a1.nl
  • ns02.a1.nl
  • ns03.a1.nl
MX
  • 10 mail.a1.nl
Verified for
  • Brevo
  • Microsoft 365

Email authentication strong

SPF
v=spf1 ip4:213.171.64.0/19 ip4:145.131.32.57 ip4:217.77.156.113 ip4:34.249.79.17 ip4:104.16.53.111 a:cdrs-middleware.a1.nl a:smtp-relay.a1.nl include:spf.emro.nl include:spf.protection.outlook.com include:mail.zendesk.com ~all
softfail (~all)
DMARC
v=DMARC1; p=quarantine; rua=mailto:rua@dmarc.brevo.com
policy: quarantine
DKIM
  • default: v=DKIM1; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDfBkgD5WyqeXxprgOiTQSbIKjDjOtCiNP0UHyuNK0CklxcNg9HMTh3kH9iPWXvpPHOrPwQkHqmzfsnyI3+noV7iNHbc…
selectors probed

Certificate (current)

R12
from 2026-04-10 to 2026-07-09
Expires in 34 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 70/100 Checked live page: https://www.a1.nl/

present
  • strict-transport-security
  • x-frame-options
  • x-content-type-options
findings
  • missing Content Security Policy
  • missing Referrer Policy
  • missing Permissions Policy
Header values
x-frame-options
SAMEORIGIN
x-content-type-options
nosniff
strict-transport-security
max-age=63072000

Links to (2)