Black-holes.org Home - SXS - Simulating eXtreme Spacetimes

The SXS project is a collaborative research effort involving multiple institutions. Our goal is the simulation of black holes and other extreme spacet...

Black-holes.org Overview

Black-holes.org belongs to FASTLY - Fastly, US. Check the list of other websites hosted by FASTLY - Fastly, US.

In terms of rank-to-traffic ratio, black-holes.org has 2,039 unique users per day, viewing 4,075 pages. The rank based value of black-holes.org is 3,114 USD. Every user makes 2.16 pageviews on average.

Black-holes.org boasts a link base consisting of 284 referring domains and 319 external backlinks, as revealed by the data obtained from web network scanning.

Black-holes.org top-level domain belongs to .ORG domain zone. Check other webpages in .ORG zone.

According the last verification test in July 01, 2026, black-holes.org has an invalid SSL certificate. Click button “Update” SSL Information at the Safety Information section.

Based on data from Google Safe Browsing, Google Safe Search, Symantec and Web of Trust black-holes.org is a fairly safe domain.

According the Mobile-Friendly test by Google black-holes.org is nice optimized for mobile devices and tablets, however the webpage speed could be improved.

Black-holes.org Website Safety

Overview

Last Updated: 07/01/2026

Overall result - black-holes.org 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: 02/06/2026

black-holes.org is safe.

Norton ConnectSafe evaluates black-holes.org for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 10/25/2019

black-holes.org is safe.

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Google Safe Browsing

Last Updated: 01/09/2019

black-holes.org 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: 03/04/2021

black-holes.org is safe.

McAfee assesses black-holes.org 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 black-holes.org for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 01/12/2019

black-holes.org child safety is very good.

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

SSL Information

SSL Checker Tool

WARNING!	Certificate download error. Previous scan results are shown below.
Domain	Unknown
Issuer Organization	Unknown
Issuer	Unknown
Algorithm	Unknown
Valid form	Unknown
Expiration	Unknown
Signed	No information
Additional Domains

Black-holes.org Rank History

Alexa Rank shows how popular black-holes.org is in comparison with other sites. The most popular site has Alexa Rank equals 1. If black-holes.org has Alexa Rank equals 100,000, then it is in TOP 100,000 popular sites in the world. The rank is calculated using a combination of average daily visitors to black-holes.org and pageviews on black-holes.org over the past 3 months.

Black-holes.org Hosting Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 54113

ASN Title: FASTLY - Fastly, US

Last Update: 05/06/2026

#
# 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: 54113
ASName: FASTLY
ASHandle: AS54113
RegDate: 2011-10-04
Updated: 2012-03-02
Comment: http://www.fastly.com/
Ref: https://rdap.arin.net/registry/autnum/54113

OrgName: Fastly
OrgId: SKYCA-3
Address: PO Box 78266
City: San Francisco
StateProv: CA
PostalCode: 94107
Country: US
RegDate: 2011-09-16
Updated: 2017-03-30
Ref: https://rdap.arin.net/registry/entity/SKYCA-3

OrgNOCHandle: FNO19-ARIN
OrgNOCName: Fastly Network Operations
OrgNOCPhone: +1-415-404-9374
OrgNOCEmail: noc@fastly.com
OrgNOCRef: https://rdap.arin.net/registry/entity/FNO19-ARIN

OrgTechHandle: FRA19-ARIN
OrgTechName: Fastly RIR Administrator
OrgTechPhone: +1-415-404-9374
OrgTechEmail: rir-admin@fastly.com
OrgTechRef: https://rdap.arin.net/registry/entity/FRA19-ARIN

OrgAbuseHandle: ABUSE4771-ARIN
OrgAbuseName: Abuse Account
OrgAbusePhone: +1-415-496-9353
OrgAbuseEmail: abuse@fastly.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE4771-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.
#

Black-holes.org Domain Registration and Settings

WHOIS

WHOIS Lookup Tool

Domain Name: BLACK-HOLES.ORG
Registry Domain ID: D107189511-LROR
Registrar WHOIS Server: whois.names4ever.com
Registrar URL: www.aplus.net
Updated Date: 2021-08-15T06:56:30Z
Creation Date: 2005-08-15T17:13:58Z
Registry Expiry Date: 2023-08-15T17:13:58Z
Registrar Registration Expiration Date:
Registrar: Deluxe Small Business Sales, Inc. d/b/a Aplus.net
Registrar IANA ID: 52
Registrar Abuse Contact Email: dns@cs.aplus.net
Registrar Abuse Contact Phone: +1.8557918966
Reseller:
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Registrant Organization: Caltech
Registrant State/Province: CA
Registrant Country: US
Name Server: NS2.ABAC.COM
Name Server: NS1.ABAC.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form https://www.icann.org/wicf/)
>>> Last update of WHOIS database: 2022-05-23T20:32:03Z

DNS Records

DNS Lookup Tool

Host	A Record	TTL
black-holes.org	131.215.193.115	86400

Host	MX Record	Priority	TTL
black-holes.org	ASPMX.L.GOOGLE.COM	1	86400
black-holes.org	ALT2.ASPMX.L.GOOGLE.COM	5	86400
black-holes.org	ALT3.ASPMX.L.GOOGLE.COM	10	86400
black-holes.org	ALT4.ASPMX.L.GOOGLE.COM	10	86400
black-holes.org	ALT1.ASPMX.L.GOOGLE.COM	5	86400

Host	NS Record	TTL
black-holes.org	ns1.aplus.net	86400
black-holes.org	ns2.aplus.net	86400
black-holes.org	ns3.aplus.net	86400

Host	TXT Record	TTL

ns1.aplus.net
TTL: 86400
Email address: hostmaster.aplus.net
Serial: 2025022813
Refresh: 7200
Retry: 86400
Expire: 3600000
Minimum: 86400

Black-holes.org HTML Check

HTML Validation Tool

Errors

Attribute “pubdate” not allowed on element “time” at this point.

Warnings

Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.

Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.

Black-holes.org Desktop Performance

Last tested: 06/06/2016

Desktop Speed

39%

Enable compression

Leverage browser caching

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

Optimize images

Minify CSS

Reduce server response time

Minify JavaScript

Minify HTML

Desktop Resource Breakdown

Total Resources	87
Number of Hosts	6
Static Resources	72
JavaScript Resources	26
CSS Resources	14

Black-holes.org Mobile Insights

Last tested: 12/17/2019

Mobile Usability

98%

Size tap targets appropriately

Mobile Speed

42%

Leverage browser caching

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

Avoid landing page redirects

Optimize images

Reduce server response time

Minify JavaScript

Minify CSS

Minify HTML

Mobile Resource Breakdown

Total Resources	91
Number of Hosts	6
Static Resources	79
JavaScript Resources	26
CSS Resources	14

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Black-holes.org Home - SXS - Simulating eXtreme Spacetimes

The SXS project is a collaborative research effort involving multiple institutions. Our goal is the simulation of black holes and other extreme spacet...

Black-holes.org Overview

Black-holes.org Website Safety

Black-holes.org Rank History

Black-holes.org Hosting Information

Black-holes.org Domain Registration and Settings

Black-holes.org HTML Check

Black-holes.org Desktop Performance

Black-holes.org Mobile Insights

Black-holes.org Similar Audits

Black-holes.org Common Typos