Skip to content
https://xs4all.nl

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
5 PASS 3 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
No CDN detected
A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.
No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

C
Crawlability
Action
robots.txt present, sitemap with 0 URLs
REVIEW
robots.txt present, sitemap with 0 URLs
Info::
robots.txt is present
Got: 10240 bytes
Info::
sitemap.xml is present
Warning::
sitemap.xml contains invalid XML
Search engines may not be able to parse the sitemap. Fix XML validation errors.
Warning::
sitemap.xml is empty — no URLs found
An empty sitemap provides no value. Add <url> entries for your pages.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Search engines may not be able to parse the sitemap. Fix XML validation errors.

Why this matters

An unparseable sitemap is silently ignored by Google — the URLs it advertises are never queued for crawl.

Learn more ▾

Google's sitemap parser is strict about XML validity. A single unescaped `&` or unclosed tag invalidates the whole file. Run your sitemap through a validator (Search Console's Sitemaps report flags it) and fix the offending entry. Most generators escape correctly; mistakes usually come from manually-written entries.

Source: sitemaps.org / Google Search Central

An empty sitemap provides no value. Add <url> entries for your pages.

Why this matters

An empty sitemap signals 'no content to index' to Google — actively harmful versus having no sitemap at all.

Learn more ▾

Google compares URLs in the sitemap against URLs it has crawled. An empty sitemap on a site with thousands of pages signals abandonment. Either populate it correctly (most CMSes auto-generate) or delete the file and let Google crawl normally.

Source: Google Search Central / sitemaps.org

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK
Size 10240 B Sitemaps referenced 0 User-agents Blocking No — crawling allowed
<!doctype html>
<html lang='nl'>
<head>
    <title>XS4ALL - First Class Internet</title>
    <meta charset="utf-8">
    <meta http-equiv="Content-Security-Policy" content="img-src 'self' https://www.xs4all.nl;">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="description" content="XS4ALL First Class Internets, Televisie en Bellen. Voor veilig en betrouwbaar internet. Al jaren bekroond voor de allerbeste service.">
    <meta name="keywords" content="XS4ALL, Internet, Televisie, Bellen, service, veiligheid, privacy">
    <meta name="theme-color" content="#FFC300">
    <meta name="msapplication-TileColor" content="#2A2A20">
    <meta name="msapplication-TileImage" content="https://www.xs4all.nl/apple-touch-icon-144x144.png">
    <meta name="fb:app_id" content="49320816941">
    <meta property="og:image" content="/assets/images/logo-xs4all.svg">
    <meta property="og:site_name" content="XS4ALL Klantenservice">
    <meta property="og:locale" content="nl_NL">
    <meta property="og:description" content="XS4ALL First Class Internets, Televisie en Bellen. Voor veilig en betrouwbaar internet. Al jaren bekroond voor de allerbeste service.">
    <meta property="og:title" content="XS4ALL - First Class Internet">
    <meta property="og:type" content="website">
    <meta property="og:url" content="https://www.xs4all.nl/">
    <link rel="shortcut icon" href="/favicon.ico">
    <link rel="icon" type="image/x-icon" href="/favicon.ico">
    <link rel="apple-touch-icon" sizes="57x57" href="/apple-touch-icon-57x57.png">
    <link rel="apple-touch-icon" sizes="114x114" href="/apple-touch-icon-114x114.png">
    <link rel="apple-touch-icon" sizes="72x72" href="/apple-touch-icon-72x72.png">
    <link rel="apple-touch-icon" sizes="144x144" href="/apple-touch-icon-144x144.png">
    <link rel="apple-touch-icon" sizes="60x60" href="/apple-touch-icon-60x60.png">
    <link rel="apple-touch-icon" sizes="120x120" href="/apple-touch-icon-120x120.png">
    <link rel="apple-touch-icon" sizes="76x76" href="/apple-touch-icon-76x76.png">
    <link rel="apple-touch-icon" sizes="152x152" href="/apple-touch-icon-152x152.png">
    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon-180x180.png">
    <link rel="icon" type="image/png" sizes="192x192" href="/favicon-192x192.png">
    <link rel="icon" type="image/png" sizes="160x160" href="/favicon-160x160.png">
    <link rel="icon" type="image/png" sizes="96x96" href="/favicon-96x96.png">
    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
    <link href="/app.css" rel="stylesheet">
    <link href="/content.css" rel="stylesheet">
    <link href="/main-header.css" rel="stylesheet">
    <link href="/main-footer.css" rel="stylesheet">
</head>
<body>
    <header id="xs4all-main-header" class="main-header">
    <div class="main-header__wrapper">
        <div class="main-header__page-overlay"></div>
        <nav aria-label="XS4ALL" class="main-header__navigation">
            <ul class="main-header__navigation-list">
                <li class="main-header__navigation-item main-header__navigation-item--with-dropdown">
                    <a data-toggle-button="" data-target="dropdown-Pakketten" href="#" class="main-header__navigation-link main-header__navigation-link--with-dropdown">
                        Pakketten
                        <svg class="icon icon--chevron-down" xmlns="http://www.w3.org/2000/svg" viewbox="0 0 10 10">
                            <path d="M9.71,3.36,5,8.06.29,3.36,1.71,1.94,5,5.24l3.29-3.3Z" class="white"></path>
                        </svg>
                    </a>
                    <ul data-collapsed="true" id="dropdown-Pakketten" class="main-header__dropdown">
                        <li class="main-header__navigation-item"><a href="https://www.kpn.com/shop/internet-tv/internet-tv/?actie=wifi&product=techdesk&campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN" class="main-header__navigation-link">Overzicht</a></li>
                        <li class="main-header__navigation-item"><a href="https://www.kpn.com/shop/internet-tv/internet/?actie=wifi&product=techdesk&campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN" class="main-header__navigation-link">Internet</a></li>
                        <li class="main-header__navigation-item"><a href="https://www.kpn.com/shop/internet-tv/internet-tv/?actie=wifi&product=techdesk&campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN" class="main-header__navigation-link">Internet &amp; Televisie</a></li>
                        <li class="main-header__navigation-item"><a href="https://www.kpn.com/shop/internet-tv/internet/?actie=wifi&bellen=ja&product=techdesk&campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN" class="main-header__navigation-link">Internet &amp; Bellen</a></li>
                        <li class="main-header__navigation-item"><a href="https://www.kpn.com/shop/internet-tv/internet-tv/?actie=wifi&product=techdesk&campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN" class="main-header__navigation-link">Alles-in-1</a></li>
                        <li class="main-header__navigation-item"><a href="https://www.kpn.com/zakelijk/kpn-een-mkb/shop/internet?campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN" class="main-header__navigation-link">Ondernemers</a></li>
                    </ul>
                </li>
                <li class="main-header__navigation-item"><a href="https://www.kpn.com/shop/internet-tv/internet-tv/?actie=wifi&product=techdesk&campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN" class="main-header__navigation-link">Shop</a></li>
                <li class="main-header__navigation-item"><a href="https://www.kpn.com/service/xs4all.htm" class="main-header__navigation-link">Service</a></li>
                <li class="main-header__navigation-item main-header__navigation-item--secondary">
                    <a href="https://webmail.xs4all.nl/?org=website/" class="main-header__navigation-link main-header__navigation-link--secondary">Webmail</a>
                </li>
                <li class="main-header__navigation-item main-header__navigation-item--secondary">
                    <a href="https://inloggen.kpn.com/#/overzicht" class="main-header__navigation-link main-header__navigation-link--secondary">Mijn KPN</a>
                </li>
            </ul>
        </nav>
        <button type="button" data-toggle-navbar="" aria-label="Toggle navigation" aria-expanded="false" class="main-header__navigation-toggle">
            <i class="icon icon--hamburger">
                <span></span>
                <span></span>
                <span></span>
            </i>
            <span class="main-header__navigation-toggle-text">
                MENU
            </span>
        </button>
        <a href="/" class="main-header__logo">
            <img src="/assets/images/xs4all-emblem-yellow.svg" alt="XS4ALL Logo" width="111" height="39">
        </a>
    </div>
</header>

    <div class="content-wrapper content-wrapper--homepage">
    <div class="cms-open">
        <section data-ats-id="masthead-7wNUOk0MO6OcQuGv8I2MRG" class="masthead masthead--7wNUOk0MO6OcQuGv8I2MRG masthead--with-buttons masthead--with-arrow masthead--next-section-yellow masthead--medium masthead--black section--black">
            <div class="masthead__image-wrapper">
                <img
                    alt="header p53 side-right karima w2000"
                    data-sizes="100vw"
                    class="xs-image-lazy-loading masthead__image image--loaded masthead__image--loaded"
                    rel="preload"
                    srcset="/assets/images/header-karima-992px.webp 992w,/assets/images/header-karima-1280px.webp 1280w,/assets/images/header-karima-1600px.webp 1600w,/assets/images/header-karima-2000px.webp 2000w"
                    sizes="100vw"
                    src="/assets/images/header-karima.jpg"
                >
            </div>
            <div class="masthead__shadow"></div>
            <div class="container masthead__container">
                <div class="masthead__content">
                    <h1 class="masthead__title">
                        XS4ALL en KPN
                    </h1>
                    <h2 class="masthead__subtitle">
                        Al meer dan 25 jaar de beste service
                    </h2>
                    <ul class="masthead__buttons list list--no-list-style">
                        <li class="masthead__button">
                            <span class="button-wrapper">
                                <a
                                    aria-label="Bestel nu"
                                    href="https://www.kpn.com/shop/internet-tv/internet-tv/?actie=wifi&product=techdesk&campaignid=tp:b=kpn:mk=cm:c=XS4ALLHussel:s=XS4ALL+over+Hussel:cd=Meer+over+KPN+Hussel:d=18112020:st=acq:e=button:f1=Meer+over+KPN"
                                    title="Bestel nu"
                                    class="button btn btn-primary"
                                >
                                    Bestel nu
                                </a>
                            </span>
                        </li>
                        <li class="masthead__button">
                            <span class="button-wrapper">
                                <a aria-label="Ik ben klant" data-ats-id="button-ik-ben-al-klant" href="https://www.kpn.com/service/xs4all.htm" title="Ik ben klant" class="button btn btn-ghost-white">
                                    Ik ben klant
                                </a>
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML No
B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.xs4all.nl/
200https://xs4all.nl/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://xs4all.nl/ → https://xs4all.nl:443/

Consistent

B
TLS Certificate Expiry & Recommendations
100 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

100
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
2 A records, 29 ms lookup
PASS
2 A records, 29 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 99.83.136.155, 75.2.72.204
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2600:9000:a400:dede:1a1c:a23f:9ae6:7bbc, 2600:9000:a504:9080:40c0:d138:ca59:2e3d
Info::
2 nameserver(s) configured
Got: ns1.kpn.net, ns11.kpn.net
Info::
1 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 29 ms
Got: 29 ms
A99.83.136.155, 75.2.72.204
AAAA2600:9000:a400:dede:1a1c:a23f:9ae6:7bbc, 2600:9000:a504:9080:40c0:d138:ca59:2e3d
CNAME—
NSns1.kpn.net, ns11.kpn.net
MX
10 mx.kpnmail.nl
TXT
google-site-verification=ixk8ILXv-df5AQBAbfJfXpu9EQUFYoHZwjAvpcG5tBE
google-site-verification=qHhbnr_ViPAAN13v4NQGHDYCfXwM__O6XS9NJFL1IRI
SPF v=spf1 include:spf.ews.kpnxchange.com ~all
MS=B895DD98732F0DADE7D04A1E53DF0DECBFEF770F
CAALookup not available with standard resolver
Resolved in 29 ms

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A
Redirect Chain
1 redirect(s), 258 ms total
PASS
1 redirect(s), 258 ms total
Info::
Single redirect
Got: https://xs4all.nl → https://www.xs4all.nl:443/ (301)
Info::
WWW normalization redirect

https://xs4all.nl

133 ms · HTTP/1.1

301

https://www.xs4all.nl:443/

125 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://xs4all.nl301133 msHTTP/1.1awselb/2.0
2https://www.xs4all.nl:443/200125 msHTTP/1.1AmazonS3

See the visual redirect chain in the HTTP Probe tab →

A+
IPv6 Readiness
IPv6 reachable (1 ms)
PASS
IPv6 reachable (1 ms)
Info::
IPv6 is configured and reachable at 2600:9000:a400:dede:1a1c:a23f:9ae6:7bbc, 2600:9000:a504:9080:40c0:d138:ca59:2e3d
Got: 1 ms connect
IPv6 Ready
AAAA Records 2600:9000:a400:dede:1a1c:a23f:9ae6:7bbc, 2600:9000:a504:9080:40c0:d138:ca59:2e3d Connection Reachable (1 ms)
A+
Domain Intelligence
xs4all.nl — via KPN B.V., 32 years, 1 months old
PASS
xs4all.nl — via KPN B.V., 32 years, 1 months old
Info::
DNSSEC is enabled
Info::
Registrar: KPN B.V.
Warning::
Registrar lock is NOT enabled
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Domain expiry

Unknown

SSL certificate

100 days

Issued by Amazon

Domain age

32 years, 1 months

Registered August 7, 1994

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2600:9000:a400:dede:1a1c:a23f:9ae6:7bbc

Registrar

KPN B.V.

Unlocked 2 NS records
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar KPN B.V.
Created August 7, 1994 (32 years, 1 months ago)
Last Updated August 21, 2025
Name Servers ns1.kpn.net, ns11.kpn.net
DNSSEC Enabled
Registrant Koninklijke KPN N.V.
Hosting
IP Address 2600:9000:a400:dede:1a1c:a23f:9ae6:7bbc
Data source: rdap (0.2s)

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

A+
HTTP Probe Timing
Total 184 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
27 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
39 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
78 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
184 ms
Total Time Total request time from DNS lookup through full response.
184 ms

Connection waterfall

DNS Lookup 27 ms TCP Connect 39 ms TLS Handshake 78 ms Server Processing 40 ms Content Transfer 0 ms
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback