Domain technical report
ERROR: The request could not be satisfied
century21.com
IPv42
IPv60
MX2
NS4
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71
Total
70
DNS
90
Email
65
Security
65
Network
60
Availability
Domaincentury21.com
IPv42
IPv60
MX records2
StatusActive
DiagnosticsMain findings and recommendations
IPv4 (A)30 / 30 pts · Dns
2 IPv4 address(es) detected.
IPv6 (AAAA)0 / 10 pts · Dns
0 IPv6 address(es) detected.
Name server redundancy20 / 20 pts · Dns
4 NS record(s); 2 or more required.
SOA record10 / 10 pts · Dns
Authoritative zone record.
DNSSEC chain0 / 15 pts · Dns
Both DS and DNSKEY are required.
CAA policy0 / 5 pts · Dns
Certificate authority restriction.
DNS propagation10 / 10 pts · Dns
Agreement between public resolvers.
MX records20 / 20 pts · Mail
2 MX record(s).
SPF25 / 25 pts · Mail
SPF policy published.
DMARC25 / 25 pts · Mail
DMARC policy published.
DKIM20 / 20 pts · Mail
A DKIM selector was verified.
MTA-STS0 / 5 pts · Mail
Mail transport policy.
TLS-RPT0 / 5 pts · Mail
TLS reporting policy.
Valid TLS certificate55 / 55 pts · Security
120 day(s) remaining.
Certificate lifetime10 / 10 pts · Security
Full points require at least 30 days remaining.
HTTP security headers0 / 35 pts · Security
0 of 9 evaluated headers detected.
PTR reverse DNS30 / 30 pts · Network
PTR: ec2-3-151-147-183.us-east-2.compute.amazonaws.com
IPv4 diversity35 / 35 pts · Network
Two or more IPv4 addresses receive full points.
IPv6 connectivity0 / 35 pts · Network
AAAA availability.
DNS resolution40 / 40 pts · Availability
At least one address family must resolve.
HTTP response0 / 40 pts · Availability
HTTP/2 403
HTTPS final URL20 / 20 pts · Availability
Final URL uses HTTPS.
DNS and emailPublished records and email configuration
A
2 record(s)3.151.147.183 3.12.225.253
AAAA
0 record(s)—
Not configured
CNAME
0 record(s)—
Not configured
MX
2 record(s)10 usb-smtp-inbound-1.mimecast.com. 10 usb-smtp-inbound-2.mimecast.com.
TXT
15 record(s)"xtfzlzs4srq28jg4gk4km1j648xjxnvt" "monday-com-verification=Vzp9M9wkXo140C0DRYV7ojmHp1rlhcE3dD23D45ox_s" "_globalsign-domain-verification=6GywlC8PVV6mLfL6ToMeVqCDeqFk9IDu2uEqmYPqx3" "v=spf1 include:spf.anywhere.re ~all" "tjng5q051jrp6tkbptv7m6qvyl9rtntw" "pardot1074273=d10fe431a3ffae55d8cad8645a55abfda9ce49ce739f57d7e5548e6b15efcd79" "facebook-domain-verification=p4r7ai7hqlnbzcott0uq5nrayy9yec" "e80af3bf63eb43f0a51118582eb565fe" "pardot1074273=69a25332aabd2241ffd148220644eb8a26a8c22e84025481d5cf9df3741b5d85" "nQAI9/Mf/i7rU4sGIqrWfd9I7TXQgwhQa87qWZI+4pUNTHHJuZ/gX1ZqlWfAYhCnWLGWOOp0Fg1lSVIECsPiUQ==" "google-site-verification=eC1QkIUk7oA0XpNCnb-3y0Dpua1xTDg1HtGv5D_wM-w" "pardot1074273=2b82518acdd71c332feed0ceaeadc1c2be67b4510570237c0f823db87e4d10b2" "pardot1074273=e8573c2e3702fa43c3ffc84b6a2c8c4fa5589037fd9cddd21ea8f7a618829080" "mcfc2lrx5l41lh272qfv6nv8w8h3514r" "atlassian-domain-verification=VU7xgQiZZa3avZ4LTJOsUdMn6RqZi0eGbU3Dk4MSPmi12S6yFEvEh/I8tLFNxlcr"
NS
4 record(s)ns-1874.awsdns-42.co.uk. ns-387.awsdns-48.com. ns-1443.awsdns-52.org. ns-629.awsdns-14.net.
SOA
1 record(s)ns-1443.awsdns-52.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
CAA
0 record(s)—
Not configured
DS
0 record(s)—
Not configured
DNSKEY
0 record(s)—
Not configured
RRSIG
0 record(s)—
Not configured
NSEC
0 record(s)—
Not configured
NSEC3
0 record(s)—
Not configured
SRV
0 record(s)—
Not configured
NAPTR
0 record(s)—
Not configured
TLSA
0 record(s)—
Not configured
SSHFP
0 record(s)—
Not configured
SPF
Configuredv=spf1 include:spf.anywhere.re ~all
DMARC
Configuredv=DMARC1; p=none; rua=mailto:41b3633887d3342@rep.dmarcanalyzer.com; ruf=mailto:41b3633887d3342@for.dmarcanalyzer.com; fo=1;
DKIM
Selector selector1v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCsjdZrMr+QuA/T4+2dN9OgY4NHZmPAi4c6JVEJGe7ckC46xm31CIX4WwUKs1N2/aL3+52oJlWSWHlA22yuB8Dzq/Cro/J1AfIj2Ve/UbWN7Ocfy0I4XTBy0inN7zubLul/9k5U7Q3JwHmiDiqqUB+SEd6+JQmCGa5M19q/z3M1KwIDAQAB; n=1024,1501547325,1517444925
Analyzed webpageMetadata and HTTP response
Title and description
ExtractedTitle
ERROR: The request could not be satisfied
Description
Final URL
https://www.century21.com:443/
HTTP status
403
HTTP
Status
HTTP/2 403
Final URL
https://www.century21.com:443/
Version
3
Server
CloudFront
X-Powered-By
SSL and HTTP securityCertificate, protocol and security headers
SSL certificate
AvailableAvailable
Yes
Issuer
Amazon
CN
century21.com
Valid from
2026-05-25T19:00:00-05:00
Valid until
2026-12-09T17:59:59-06:00
Days remaining
120
Protocol
TLSv1.3
Cipher
TLS_AES_128_GCM_SHA256
Security headers
0 activeHSTSNot detected
Content Security PolicyNot detected
X-Content-Type-OptionsNot detected
X-Frame-OptionsNot detected
Referrer PolicyNot detected
Permissions PolicyNot detected
Cross-Origin-Opener-PolicyNot detected
Cross-Origin-Embedder-PolicyNot detected
Cross-Origin-Resource-PolicyNot detected
DNS propagationComparison across public resolvers
Public resolver comparison
ConsistentConsistent propagation
5 public resolvers queried.
ResolverServerResultLatency
Google
8.8.8.83.12.225.253, 3.151.147.183
50,91 ms
Cloudflare
1.1.1.13.12.225.253, 3.151.147.183
42,92 ms
Quad9
9.9.9.93.12.225.253, 3.151.147.183
54,91 ms
OpenDNS
208.67.222.2223.12.225.253, 3.151.147.183
29,14 ms
AdGuard
94.140.14.143.12.225.253, 3.151.147.183
144,87 ms
IP, geolocation and ASNAssociated network information
3.151.147.183
No datasuccess
No
country
region
city
asn
organization
isp
3.12.225.253
No datasuccess
No
country
region
city
asn
organization
isp
Visitor information
Visitorip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No
SMTPEmail port connectivity
usb-smtp-inbound-1.mimecast.com
Port 25: Closed/unreachable - 0.9 ms - Port 465: Closed/unreachable - 4016.9 ms - Port 587: Closed/unreachable - 57 ms - 220 usb-smtp-inbound-1.mimecast.com ESMTP; Tue, 11 Aug 2026 08:20:51 -0700