headfirst.nl ▷ Zelfstandig professionals

Quick Summary

Online Status

Offline

Server IP address resolved: No
Http response code: None
Last Checked: 11/12/2024

Headfirst.nl traffic volume is 90 unique daily visitors and their 180 pageviews. The web value rate of headfirst.nl is 3,124 USD. Each visitor makes around 2.14 page views on average.

By Alexa's traffic estimates headfirst.nl placed at 127,772 position over the world.

Headfirst.nl registered under .NL top-level domain. Check other websites in .NL zone.

The last verification results, performed on (August 06, 2024) headfirst.nl show that headfirst.nl has an expired SSL certificate issued by Let's Encrypt (expired on September 30, 2024). Click “Refresh” button for SSL Information at the Safety Information section. Check the list of websites using SSL certificates issued by Let's Encrypt.

In accordance with Google Safe Browsing, Google Safe Search and Symantec headfirst.nl is pretty a safe domain.

Relying Google MobileFriendly test headfirst.nl is well optimized for mobile and tablet devices, however web page loading speed may be improved.

Headfirst.nl General Information

Global Rank

4,024,712

Average Load Time

2.34sec

Links In Count

Website Value

$2,920

Audience Geography. Where are headfirst.nl visitors located?

Country	Visitors

Country	Pageviews

Country	Rank

Where do visitors go on headfirst.nl?

Subdomain	Pageviews

Subdomain	Pageviews per User

Subdomain	Reach

How popular is headfirst.nl?

Period	Global Rank	Global Rank Delta
past 3 months	4024712	2819701

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	4106712	2759438	0	-81.716%	2	-9.434%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	4122624	2915121	6	-80.159%

Headfirst.nl Safety Information

Overview

Last Updated: 11/12/2024

Overall result - headfirst.nl is safe.

We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.

Norton Connect Safe

Last Updated: 02/05/2024

headfirst.nl is safe.

Norton ConnectSafe evaluates headfirst.nl for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 09/06/2019

headfirst.nl is safe.

SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.

Google Safe Browsing

Last Updated: 01/09/2019

headfirst.nl is safe.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.

Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.

Site Advisor

Last Updated: 01/11/2021

headfirst.nl is safe.

McAfee assesses headfirst.nl for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze headfirst.nl for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 11/12/2024

headfirst.nl child safety is unknown.

The WOT calculates reputation of the headfirst.nl. This reputation system receives ratings from users and information from third-party sources, assesses the headfirst.nl for safety features and confirms, whether headfirst.nl is suitable for children.

SSL Information

SSL Checker Tool

Domain	headfirst.nl
Issuer Organization	Let's Encrypt
Issuer	R11
Algorithm	RSA-SHA256
Valid form	07/02/2024
Expiration	09/30/2024
Signed	Certificate is not self signed
Additional Domains	headfirst.nl www.headfirst.nl

Headfirst.nl Server Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 16509
ASN Title: AMAZON-02 - Amazon.com, Inc., US

Last Update: 03/02/2024

ASN Whois

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 16509
ASName: AMAZON-02
ASHandle: AS16509
RegDate: 2000-05-03
Updated: 2012-03-02
Ref: https://rdap.arin.net/registry/autnum/16509

OrgName: Amazon.com, Inc.
OrgId: AMAZON-4
Address: 1918 8th Ave
City: SEATTLE
StateProv: WA
PostalCode: 98101-1244
Country: US
RegDate: 1995-01-23
Updated: 2017-01-28
Ref: https://rdap.arin.net/registry/entity/AMAZON-4

OrgAbuseHandle: AEA8-ARIN
OrgAbuseName: Amazon EC2 Abuse
OrgAbusePhone: +1-206-266-4064
OrgAbuseEmail: abuse@amazonaws.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/AEA8-ARIN

OrgTechHandle: ANO24-ARIN
OrgTechName: Amazon EC2 Network Operations
OrgTechPhone: +1-206-266-4064
OrgTechEmail: amzn-noc-contact@amazon.com
OrgTechRef: https://rdap.arin.net/registry/entity/ANO24-ARIN

RTechHandle: AC6-ORG-ARIN
RTechName: Amazon-com Incorporated
RTechPhone: +1-206-266-2187
RTechEmail: ipmanagement@amazon.com
RTechRef: https://rdap.arin.net/registry/entity/AC6-ORG-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

Headfirst.nl Domain Name Information

WHOIS

WHOIS Lookup Tool

Domain Whois

Domain name: headfirst.nl
Status: active

Reseller:
TransIP
Vondellaan 47
2332AA Leiden
Netherlands

Registrar:
team.blue nl B.V.
Vondellaan 47
2332AA Leiden
Netherlands

Abuse Contact:
abuse@nl.team.blue

Creation Date: 2000-01-20

Updated Date: 2021-11-14

DNSSEC: yes

Domain nameservers:
ns0.transip.net
ns1.transip.nl
ns2.transip.eu

Record maintained by: NL Domain Registry

Copyright notice
No part of this publication may be reproduced, published, stored in a
retrieval system, or transmitted, in any form or by any means,
electronic, mechanical, recording, or otherwise, without prior
permission of the Foundation for Internet Domain Registration in the
Netherlands (SIDN).
These restrictions apply equally to registrars, except in that
reproductions and publications are permitted insofar as they are
reasonable, necessary and solely in the context of the registration
activities referred to in the General Terms and Conditions for .nl
Registrars.
Any use of this material for advertising, targeting commercial offers or
similar activities is explicitly forbidden and liable to result in legal
action. Anyone who is aware or suspects that such activities are taking
place is asked to inform the Foundation for Internet Domain Registration
in the Netherlands.
(c) The Foundation for Internet Domain Registration in the Netherlands
(SIDN) Dutch Copyright Act, protection of authors' rights (Section 10,
subsection 1, clause 1).

DNS Records

DNS Lookup Tool

Host	A Record	TTL

Host	MX Record	Priority	TTL

Host	NS Record	TTL

Host	TXT Record	TTL

Headfirst.nl HTML Validation

HTML Validation Tool

Errors

Attribute “ng-app” not allowed on element “html” at this point.

Attribute “keywords” not allowed on element “meta” at this point.

Element “meta” is missing one or more of the following attributes: “charset”, “content”, “http-equiv”, “itemprop”, “name”, “property”.

Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.

Attribute “ng-class” not allowed on element “body” at this point.

Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.

No space between attributes.

Attribute “class"form-control” not allowed on element “input” at this point.

Attribute “input-text"” not allowed on element “input” at this point.

Stray end tag “input”.

Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)

Attribute “ng-controller” not allowed on element “nav” at this point.

Attribute “ng-class” not allowed on element “nav” at this point.

Attribute “fat” not allowed on element “ul” at this point.

Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)

Attribute “ng-click” not allowed on element “a” at this point.

Stray end tag “span”.

Duplicate ID “bs-example-navbar-collapse-1”.

Duplicate ID “menu-neutral-top-menu”.

Stray end tag “div”.

Duplicate ID “sub”.

Element “style” not allowed as child of element “header” in this context. (Suppressing further errors from this subtree.)

The element “a” must not appear as a descendant of the “button” element.

Attribute “ng-controller” not allowed on element “div” at this point.

Attribute “ng-class” not allowed on element “div” at this point.

Attribute “ng-model” not allowed on element “input” at this point.

Attribute “ng-click” not allowed on element “input” at this point.

Bad value “” for attribute “action” on element “form”: Must be non-empty.

Duplicate attribute “value”.

Element “div” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)

Attribute “ng-init” not allowed on element “div” at this point.

Attribute “ng-class” not allowed on element “img” at this point.

Attribute “ng-click” not allowed on element “img” at this point.

Warnings

Consider avoiding viewport values that prevent users from resizing documents.

Attribute “class"form-control” is not serializable as XML 1.0.

Attribute “input-text"” is not serializable as XML 1.0.

Empty heading.

The first occurrence of ID “bs-example-navbar-collapse-1” was here.

The first occurrence of ID “menu-neutral-top-menu” was here.

The first occurrence of ID “sub” was here.

This document appears to be written in Dutch but the “html” start tag has “lang="en"”. Consider using “lang="nl"” (or variant) instead.

Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).

Headfirst.nl Desktop Insights

Last tested: 11/20/2015

Desktop

Desktop Speed

50%

Enable compression

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Leverage browser caching

Minify JavaScript

Optimize images

Minify CSS

Reduce server response time

Minify HTML

Desktop Resource Breakdown

Total Resources	56
Number of Hosts	9
Static Resources	35
JavaScript Resources	32
CSS Resources	11

Headfirst.nl Mobile Insights

Last tested: 06/28/2018

Mobile

Mobile Usability

100%

Mobile Speed

20%

Optimize images

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Avoid landing page redirects

Reduce server response time

Leverage browser caching

Enable compression

Minify JavaScript

Minify HTML

Minify CSS

Mobile Resource Breakdown

Total Resources	63
Number of Hosts	10
Static Resources	52
JavaScript Resources	23
CSS Resources	10

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Headfirst.nl Zelfstandig professionals - HeadFirst.nl

Quick Summary

Headfirst.nl General Information

Headfirst.nl Safety Information

Headfirst.nl Server Information

Headfirst.nl Domain Name Information

Headfirst.nl HTML Validation

Headfirst.nl Desktop Insights

Headfirst.nl Mobile Insights

Headfirst.nl Nearest Competitors

Headfirst.nl Typos