21cm.com 21st Century Medicine --Expanding the Boundaries of Preservation Science
Server IP address resolved: No
Http response code: None
Last Checked: 11/02/2026
21cm.com attracts 1,614 unique visitors daily, generating 3,227 pageviews. The estimated value of 21cm.com is 2,311 USD. Each visitor views approximately 2.14 pages on average.
21cm.com is hosted by LINODE-AP Linode, LLC, US. Check out other websites hosted by LINODE-AP Linode, LLC, US.
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21cm.com is registered with the .COM top-level domain. Explore additional websites within the .COM zone.
A recent examination on (March 23, 2022), indicates that 21cm.com has an expired SSL certificate issued by Let's Encrypt (expired on June 13, 2022). Click the "Refresh" button in the Safety Information section for updated SSL details. See the list of websites using SSL certificates issued by Let's Encrypt.
According to Google Safe Browsing and Symantec 21cm.com appears to be a safe domain.
Based on Google's Mobile-Friendly test, 21cm.com is not well optimized for mobile and tablet devices. Ensuring your site is mobile-friendly guarantees better performance across all devices, and improving the web page loading time could further enhance user experience.
not found
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 ConnectSafe evaluates 21cm.com for any unsafe and insecure content. The results are critical for families with young children.
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.
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.
McAfee assesses 21cm.com 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 21cm.com for mature or inappropriate content, only security checks are evaluated.
The WOT calculates reputation of the 21cm.com. This reputation system receives ratings from users and information from third-party sources, assesses the 21cm.com for safety features and confirms, whether 21cm.com is suitable for children.
| Domain | www.21cm.com |
| Issuer Organization | Let's Encrypt |
| Issuer | R3 |
| Algorithm | RSA-SHA256 |
| Valid form | 03/15/2022 |
| Expiration | 06/13/2022 |
| Signed | Certificate is not self signed |
| Additional Domains |
21cm.com www.21cm.com |
ASN ID: 63949
ASN Title: LINODE-AP Linode, LLC, US
Last Update: 12/29/2025
#
# 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: 63488 - 64197
ASName: IANA-RSVD
ASHandle: AS63488
RegDate: 2013-06-07
Updated: 2013-06-07
Ref: https://rdap.arin.net/registry/autnum/63488
OrgName: Internet Assigned Numbers Authority
OrgId: IANA
Address: 12025 Waterfront Drive
Address: Suite 300
City: Los Angeles
StateProv: CA
PostalCode: 90292
Country: US
RegDate:
Updated: 2012-08-31
Ref: https://rdap.arin.net/registry/entity/IANA
OrgAbuseHandle: IANA-IP-ARIN
OrgAbuseName: ICANN
OrgAbusePhone: +1-310-301-5820
OrgAbuseEmail: abuse@iana.org
OrgAbuseRef: https://rdap.arin.net/registry/entity/IANA-IP-ARIN
OrgTechHandle: IANA-IP-ARIN
OrgTechName: ICANN
OrgTechPhone: +1-310-301-5820
OrgTechEmail: abuse@iana.org
OrgTechRef: https://rdap.arin.net/registry/entity/IANA-IP-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.
#
Domain Name: 21CM.COM
Registry Domain ID: 133895_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.networksolutions.com
Registrar URL: http://networksolutions.com
Updated Date: 2021-09-20T17:15:29Z
Creation Date: 1996-09-17T04:00:00Z
Registry Expiry Date: 2026-09-16T04:00:00Z
Registrar: Network Solutions, LLC
Registrar IANA ID: 2
Registrar Abuse Contact Email: domain.operations@web.com
Registrar Abuse Contact Phone: +1.8777228662
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: CYBER30.CSZ.COM
Name Server: CYBER35.CSZ.COM
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-04-07T10:05:11Z
| Host | A Record | TTL |
|---|---|---|
| 21cm.com | 45.79.81.41 | 21600 |
| Host | MX Record | Priority | TTL |
|---|---|---|---|
| 21cm.com | 21cm-com.mail.protection.outlook.com | 10 | 21600 |
| Host | NS Record | TTL |
|---|---|---|
| 21cm.com | cyber35.csz.com | 21600 |
| 21cm.com | cyber30.csz.com | 21600 |
| Host | TXT Record | TTL |
|---|---|---|
| 21cm.com | google-site-verification=fcU9wPl2NQN0309q1eN6LVV_rah2k1cnUsfVv_x5B8s | 21600 |
| 21cm.com | v=spf1 include:spf.protection.outlook.com -all | 21600 |
cyber30.csz.com
TTL: 21600
Email address: root.csz.com
Serial: 21011300
Refresh: 10800
Retry: 21600
Expire: 18000
Minimum: 21600
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