Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DRedirect ChainAction2 redirect(s), 1083 ms totalFIX
https://aon.com
546 ms · HTTP/1.0
https://www.aon.com/
113 ms · HTTP/1.1
https://www.aon.com/en/
424 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://aon.com | 301 | 546 ms | HTTP/1.0 | BigIP |
| 2 | https://www.aon.com/ | 301 | 113 ms | HTTP/1.1 | cloudflare |
| 3 | https://www.aon.com/en/ | 200 | 424 ms | HTTP/1.1 | cloudflare |
See the visual redirect chain in the HTTP Probe tab →
Each redirect adds latency. Try to minimize the chain to 1 hop.
Redirect chain — each hop adds latency; combine into one redirect where possible.
Source: Google Search Central / web.dev
DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BTLS Certificate Expiry & Recommendations163 days until leaf cert expires — 4 issues to addressREVIEW
Certificate validity
Recommended actions
- Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
- Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+DNS Records1 A records, 115 ms lookupPASS
| A | 165.125.80.231 |
| AAAA | — |
| CNAME | — |
| NS | jacqueline.ns.cloudflare.com, gabe.ns.cloudflare.com |
| MX | 10 aon-com.mail.protection.outlook.com |
| TXT | docker-verification=5d2997cb-5b32-44c6-add7-a864a586843d facebook-domain-verification=51aki2xlid1syv11p2gqu9uns1m2mg onetrust-domain-verification=bf65a86be4084c06a6ff98085056f072 lPaKmQd4OuzaLI80NuYf4oWjjioQHHrv 5f923f19-d439-4f87-8b12-bc624a7fce04 anthropic-domain-verification-wvwgj4=PoT0WewoNtjkYV9qwiOWekzTd google-site-verification=B1xVyEjI7Oy-M-0HncjZit1y09vNQ6KDq3UJSo9QNcM docusign=897bb959-9a55-472f-9dc6-297e76d60509 _sx9uo3v6iotet8mg9k2yczsg0bykfz8 smartsheet-site-validation=r_A0A11a_4OfDrkos3OImg62T_2JORPc v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDeMV0tAmQNF4IZmHtdO0TxjFYI... k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC0B2BEyvbwtiYE9r9e5Y52GljiATMf4IcL... ibmid=7ffa7167-ef8b-4097-a8fd-585812375a73 onetrust-domain-verification=462bc09312a54e0a8f5c1c37e362a97d apple-domain-verification=qfSPYt9mXSzlJmR7 yW+Ww2obkqaTg1q2U9nXJieN9l992Jn23sX2nq+bP1pQgUrI500DoAEhjdC/ES089waFff6KzHY3XHPu... spf-au.iress.com; au1smtp.iress.com.au cloudhealth=21c504b4-3738-4cbb-8f0d-66a1b0366d82 so3JwnjOqgmyARrpUm7owLeCOZ0kApg7ZxFL2hOUP4noVN5hU5yo92/0UhpDEqhtNtR8TymW/ePy7Aop... webexdomainverification.4C675B877D2DB136E053AB06FC0A3F65=f577defc-2876-4313-aae9... SPF v=spf1 include:spf.aon.net include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all mandrill_verify.AArsyFKIBMQLWezOxzMX0Q 61ed8a76-7c2d-4d94-8906-89f599de4ac9 _0l96cz12cicizii2x756vxhqbh340tp zywave-domain-verification=zW11vnQwSJwDxrNDnGvswjeUItUyL2AC0XumU/FjBv8= stripe-verification=cd9241476913b8b96233ec2fec5c213ea6582ab618d8b6f2dd27df0238c8... yahoo-verification-key=xIcnI6b7TC4c7/lnzIefhwrkJKcwh0pi54N7x1HNxuU= google-site-verification=9fxlEhlFADQFRrN9iXlV6E0ITsMSnRBD1nOgWK00hu4 cloudhealth=b7b8a55b-59ba-4546-950b-6809b5b27533 f+W2NPk2W4z5yQtup/YYp00LUyaVo0MHnuKZiNMk8PQ= ms-domain-verification=2bf72f2e-c25e-4e2e-b62d-a48e8f2207f5 stripe-verification=19752c5103355dcd7f6ba82d8b6d8a3b5b104341e1aaf62aad6a98ae7372... cisco-ci-domain-verification=1b229c06e22daaae0b61037921b6f562b8a0f5e74d3c397b2ba... stripe-verification=50e561f7b38b3cbc106ba493ef6cb116978846d076b0c491697512fc7ed6... stripe-verification=c469db77c1c298fd4ed7c2e09777cb4aea6da824ee739a0cf7a54431c2da... ms-domain-verification=be23387f-2dbc-477d-84e9-e2b2bf5dffa3 segment-site-verification=lPaKmQd4OuzaLI80NuYf4oWjjioQHHrv atlassian-domain-verification=4B2A1eOljaMNfiq1qW4Tx9HaqNAF1u4H5dr39luRvEgNiG7L2p... _github-challenge-aonplc-ent censys-domain-verification=GCMluw0_MlFv3pIJjejoJKnhK3vKHwpOxPL2Tkg80qKf vmware-cloud-verification-b5ca0c82-8621-4617-b94c-c636e69edcaa _an2rf31709humwgzn4mhyfyofczb0qh flexera-domain-verification-dmglgarnbjmgayje amazonses:YMAOVs9ptRA+eRfNkdSA65eT2xV34wExoCfVEg/4pQI= _zi597fnx1decjgsrd4jotuk14gpm877 atlassian-domain-verification=yGRztRDc9kCq/anB63h3TyR0rJnrq7d5GaReJggmA8/YuYfX69... jamf-site-verification=eTzZ9qT2il9YOKYog5Zjxw stripe-verification=9df87df7bf1b5eabb56726455b343007ce0dd57389542b6565ca891c956d... figma-domain-verification=d620b889974ad0d1fdd07942f67906d3087c0ba734f56aa07c7c91... stripe-verification=c1d8f1d9f4eaa9c14f1e3680afc3dfa18bf382409df348abf70dc734af83... docusign=81f813fa-784a-414f-882a-567d40872cec google-site-verification=CMPgf3BxpQ7WrlljaAH-laYA8ahhSCuwzOB2Se-radI _16012i7dexg6eajc3zuu74j4dk085di aon-mclagan-investor-surveys.azurewebsites.net segment-site-verification=ukYaf689KxZnq1FstJ3CsDwQhzxG6MQi _oktaverification.auth-dev.tbs.aon.com yahoo-verification-key=Wix6z22rEtScsoxVTcG+aq5NWE+ZuSudt6Vb+QJvp5w= ms-domain-verification=c1611657-822d-42a7-a4f5-14dd8dd7e82b stripe-verification=14b715c20711b5f86190064cc0d324c721a8b99efee96b4710557e6dadba... |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.
Learn more ▾ ▴
Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.
Source: SRE practice / DNS architecture
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
A+Crawlabilityrobots.txt present, sitemap with 2 URLsPASS
User-agent: Googlebot
Disallow: /nogooglebot/
User-agent: *
Disallow: /bursts/
Disallow: /surveys/
Disallow: /pages/
Disallow: *.pdf
Disallow: /attachements/
Disallow: /attachments/*
Disallow: /*.pdf$
Disallow: /mypreferences-staging/
Sitemap: https://www.aon.com/sitemap-master.xml
A+URL Variantswww/non-www, trailing slash, HTTP→HTTPSPASS
www / non-www
Preferred variant: non-www
HTTP → HTTPS
Consistent
A+Domain Intelligenceaon.com — via CSC Corporate Domains, Inc., 31 years, 7 months old, hosted on AS16875 - AON Corporation, USPASS
244 days
February 15, 2027
163 days
Issued by DigiCert Inc
31 years, 7 months
Registered February 14, 1995
Not enabled
Protects against DNS spoofing
AS16875 - AON Corporation, US
ASN AS16875
165.125.80.231
CSC Corporate Domains, Inc.
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033
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.
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