3rd World Geek

https://github.com/barnybug/cli53 allows folk coming from AWS Route 53 to create a BIND file to upload to Cloudflare.

https://www.peeringdb.com/net/4224 Cloudflare peering.

https://stat.ripe.net/AS13335 Cloudflare on RIPE

https://bgp.he.net/AS13335 Cloudflare BGP

https://nettools-staging.as13335.net/ Cloudflare NetTools

https://www.dnsperf.com/dns-speed-benchmark check DNS performance for a given domain

https://developers.facebook.com/tools/debug/sharing/ check why content is not shareable on Feishbol

https://www.dareboost.com/en/website-speed-test-http2-vs-http1 HTTP/2 speed comparison

https://search.google.com/test/mobile-friendly Mobile-Friendly Test - Google Search Console

https://gf.dev/http2-test HTTP/2 test

https://http2.akamai.com/demo Check HTTP/2 browser support

https://eais.rkn.gov.ru/en/#form Check for Russian blocks

https://www.blocked.org.uk/ Check for UK blocks

https://www.denic.de/en/service/tools/nast/ DENIC Nameserver Predelegation Check Web Interface

https://httpstatus.io/ Easily check status codes, response headers, and redirect chains.

https://caddyserver.com/docs/mitm-detection Detecting HTTPS Interception

https://www.comlot.ch/en/gambling-in-switzerland/access-blocking/blacklist Switzerlads's Comlot’s blacklist of domain names of foreign gambling operators to be blocked

https://www.esbk.admin.ch/esbk/it/home/illegalesspiel/zugangssperren.html The blacklist of the Swiss Federal Gaming Board

https://www.radb.net/query The Internet Routing Registry - RADb

https://inforedes.labs.lacnic.net/

https://rdap-web.lacnic.net/

https://netox.apnic.net/

https://bgpview.io/

https://www.ripe.net/analyse/internet-measurements/ixp-country-jedi IXP Country Jedi

https://www.caida.org/services/

https://www.cidr-report.org/

https://www.smartfense.com/en-us/tools/spoofcheck/

https://observatory.manrs.org/

https://check-your-website.server-daten.de/

https://ping.pe/

https://filter.sa/en/unblock Request Saudi Arabia's Communications and Information Technology Commission CITC to remove a block.

https:/trustedsource.org/ McAfee^® provides an online tool that enables you to check if a site is categorized within various versions of the SmartFilter Internet Database or the Webwasher URL Filter Database.

https://asm.ca.com/en/checkit.php CA App Synthetic Monitor

https://bkgtycvd.share.thousandeyes.com/view/tests/?roundId=1595020200&metric=availability&scenarioId=dnsServer&testId=1432487 1.1.1.1 in ThousandEyes

https://wheresitup.com/ Verify Global Accessibility Without Leaving Your Desk

https://wheresitfast.com/ Check your site’s status, DNS results & routes around the world!

https://shotsherpa.com/ View your website around the world without a single customs agent

https://exchange.xforce.ibmcloud.com/ IBM X-Force Exchange

https://www.linkedin.com/post-inspector/ LinkedIn Post Inspector

https://www.http3check.net/ HTTP/3 Check

https://gf.dev/http3-test Geekflare HTTP/3 Testing Tool

https://beian.miit.gov.cn/#/Integrated/recordQuery China ICP/IP address/domain name information filing management system

https://letsdebug.net/ Let's Debug is a diagnostic tool/website to help figure out why you might not be able to issue a certificate for Let's Encrypt™.

https://sweeps.ai/3rd-party-analyzer/ 3rd-party Performance Analyzer

https://dnsspy.io/labs/caa-validator DNS Spy: CAA record validator

Find the IP Address Ranges Used by Amazon S3

https://cloudflare-pages.manfredi.io/ Cloudflare Tools (Connection Statistics, Datacenter Statistics, Datacenter Map)

https://testconnectivity.microsoft.com/tests/o365 Microsoft Remote Connectivity Analyzer

https://mha.azurewebsites.net/ Message Header Analyzer

https://esnicheck.com/

https://domainbigdata.com/ DomainBigData is a big database of domains and whois records

https://petscams.com/ Petscams.com was created with the purpose of cataloguing the latest websites built by scammers.

https://securityheaders.com/

What is my IP address? — ifconfig.co

Online nslookup — Find DNS records nslookup.io

https://www.boce.com/ boce network monitoring platform (China)

https://dronebl.org/ DroneBL is a realtime monitor of abusable IPs, which has the goal of stopping abuse of infected machines.

https://www.entrust.com/resources/certificate-solutions/tools/certificate-transparency-search Entrust Certificate Search

https://rpki.cloudflare.com/

https://dynamic-dns-checker.tools.wiz.io/ Dynamic DNS Leakage Tester

https://www.nic.cl/dominios/doctorDNS/ doctorDNS, Herramiento de diagnóstico de DNS

https://ednscomp.isc.org/ EDNS Compliance Tester

https://ja3er.com/ This project is about collecting and sharing JA3 hashes.

https://sslbl.abuse.ch/ja3-fingerprints/ A list of malicious JA3 fingerprints identified by SSLBL. SSL Blacklist (SSLBL) is a project operated by abuse.ch

https://host-tools.com/ "online tools to test your Internet Speed, E-mail checker, your IP address, your Hostname, Domain DNS records, Domain Whois Information and more!"

https://www.cdnplanet.com/geo/ Content Delivery Networks per country

https://testlocal.ly/ TestLocally takes screenshots of websites from different locations around the world

https://ixp.cabase.org.ar/estadisticas.html Tráfico Agregado - IXPs CABASE Argentina

https://azurespeedtest.azurewebsites.net/ Azure Speed Test 2.0

http://awsspeedtest.xvf.dk/ AWS Region Speed Test

https://boce.aliyun.com/detect/http Alibaba Cloud's Network Detect Tool

https://cf.sjr.org.uk/tools/

https://otx.alienvault.com/ The World’s First Truly Open Threat Intelligence Community

https://www.robtex.com/ Robtex is used for various kinds of research of IP numbers, Domain names, etc

https://malpedia.caad.fkie.fraunhofer.de/ The primary goal of Malpedia is to provide a resource for rapid identification and actionable context when investigating malware.

https://opentip.kaspersky.com/ Kaspersky Threat Intelligence Portal

Bitcoin Abuse Database

https://www.bitcoinabuse.com/

Looking glasses

https://enterprise.verizon.com/why-verizon/looking-glass/

https://ipms.chinatelecomglobal.com/public/lookglass/lookglassDisclaimer.html

https://lg.serverius.net/

http://looking-glass.connect.com.au/lg/ TPG (AS 7545) and AAPT (AS 2764)

https://www.msk-ix.ru/en/lookingglass/ Moscow IX

https://www.cogentco.com/en/network/looking-glass

https://lookingglass.centurylink.com/

https://lg.telia.net/