Verifying against the live site and live WHOIS/DNS…
Common questions
Is csoonline.com legit or a scam?
AboutUs doesn't label sites "legit" or "a scam": this page lists the dated registration, DNS, HTTPS, mail-authentication and safety checks we could verify, each with its source, so you can decide for yourself.
Who owns csoonline.com?
Nobody has completed AboutUs's owner verification for csoonline.com. That's true of most sites here — it isn't itself a warning sign.
Correct a description, link or other detail. Submissions are reviewed before publication.
Lifeline · csoonline.com over time
Checked in the last 30 daysOlder, dated recordFrom registration records
Registered 24 years ago · on AboutUs since 2014 · 3 registrar changes since May 12, 2007 · 3 ownership changes since 2007 · last checked Oct 10, 2026.
Registration
RegisteredMar 21, 2002csoonline.com was registered on Mar 21, 2002.Source: RDAP, fetched Sep 18, 2026
AboutUs record
AboutUs wiki pageApr 4, 2014An AboutUs wiki page described csoonline.com from Apr 4, 2014 to Apr 4, 2014 (1 edit).Source: AboutUs wiki archive, 2006–2023Current AboutUs record
Registrar
Markmonitor.comMarkmonitor.comMay 12, 2007 – Sep 9, 2011Registrar Markmonitor.com in the WHOIS and RDAP records held for csoonline.com, from May 12, 2007 to Sep 9, 2011.Source: WHOIS / RDAP archive (who.is)MarkMonitor, Inc.
Ownership
Ownership recordsMay 12, 2007 – May 14, 2026Registration records for csoonline.com are held from May 12, 2007 to May 14, 2026 (607 records). 3 changes of registrant name or organization are marked. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Zone file
No nameserver records held, Aug 2012 – Oct 2013Nameservers: MarkMonitorNameservers: MarkMonitorMay 12, 2007 – Aug 24, 2012Registration records listed MarkMonitor nameservers (ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com…) for csoonline.com from May 12, 2007 to Aug 24, 2012.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
AmazonAmazonJun 23, 2025 – Oct 27, 2026Amazon issued 12 certificates for csoonline.com from Jun 23, 2025, the latest valid until Apr 6, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
20052010201520202025Apr ’26← last 12 months, drawn wider
Every dated fact on this lifeline (26)
Mar 21, 2002Registration: csoonline.com was registered on Mar 21, 2002.Source: RDAP, fetched Sep 18, 2026
May 12, 2007 – Sep 9, 2011Registrar: Registrar Markmonitor.com in the WHOIS and RDAP records held for csoonline.com, from May 12, 2007 to Sep 9, 2011.Source: WHOIS / RDAP archive (who.is)
May 12, 2007 – May 14, 2026Ownership: Registration records for csoonline.com are held from May 12, 2007 to May 14, 2026 (607 records). 3 changes of registrant name or organization are marked. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
May 12, 2007 – Aug 24, 2012Zone file: Registration records listed MarkMonitor nameservers (ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com…) for csoonline.com from May 12, 2007 to Aug 24, 2012.Source: From registration records (WHOIS / RDAP archive, who.is)
Sep 3, 2007Ownership: The registrant name or organization in the registration record changed; first recorded Sep 3, 2007. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Sep 4, 2007
Jun 22, 2026 – Sep 18, 2026 (latest)
Authority and Safety last refreshed Sep 18, 2026.
Source: AboutUs checks
Dec 19, 2011
Registrar MarkMonitor, Inc. (IANA 292) in the registration data recorded on Dec 19, 2011.
Source: WHOIS / RDAP archive (who.is)
Markmonitor.comJan 7, 2012 – Oct 23, 2013Registrar Markmonitor.com in the WHOIS and RDAP records held for csoonline.com, from Jan 7, 2012 to Oct 23, 2013.Source: WHOIS / RDAP archive (who.is)
MarkMonitor, Inc.MarkMonitor, Inc.Jul 10, 2016 – May 14, 2026 (latest)Registrar MarkMonitor, Inc. (IANA 292) in the WHOIS and RDAP records held for csoonline.com, from Jul 10, 2016 to May 14, 2026.Source: WHOIS / RDAP archive (who.is)
Ownership change
Sep 3, 2007
The registrant name or organization in the registration record changed; first recorded Sep 3, 2007. Who it changed to is in the full report.
Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Ownership changeSep 4, 2007The registrant name or organization in the registration record changed; first recorded Sep 4, 2007. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Ownership changeNov 7, 2007The registrant name or organization in the registration record changed; first recorded Nov 7, 2007. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
3 ownership changes, 2007–2026
Nameservers: MarkMonitorOct 18, 2013 – Mar 27, 2015MarkMonitor (ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com…) were the nameservers listed for csoonline.com at every ICANN zone-file snapshot AboutUs holds from Oct 18, 2013 to Mar 27, 2015 (snapshots exist for only part of 2013–2018).Source: ICANN zone-file snapshots, 2013–2018 (legacy archive)
Nameservers: pcworld.com, pnap.netSep 23, 2015 – Apr 3, 2018pcworld.com, pnap.net (ns-a.pnap.net, ns-b.pnap.net, ns-c.pnap.net…) were the nameservers listed for csoonline.com at every ICANN zone-file snapshot AboutUs holds from Sep 23, 2015 to Apr 3, 2018 (snapshots exist for only part of 2013–2018).Source: ICANN zone-file snapshots, 2013–2018 (legacy archive)
DNS moved to pcworld.com, pnap.netSep 23, 2015csoonline.com's nameservers moved from MarkMonitor to pcworld.com, pnap.net at some point between Mar 27, 2015 and Sep 23, 2015. Last seen at MarkMonitor: Mar 27, 2015 (ICANN zone-file snapshot). First seen at pcworld.com, pnap.net: Sep 23, 2015 (ICANN zone-file snapshot). AboutUs holds no nameserver records for the 6 months in between, so the date of the move is not known more closely.Source: Derived from the nameserver records on this lifeline (ICANN zone-file snapshot → ICANN zone-file snapshot)
Nameservers: pcworld.com, pnap.netNameservers: pcworld.com, pnap.netApr 4, 2018 – Aug 25, 2023Registration records listed pcworld.com, pnap.net nameservers (ns-a.pnap.net, ns-b.pnap.net, ns-c.pnap.net…) for csoonline.com from Apr 4, 2018 to Aug 25, 2023. Days a zone file covers are shown from the zone file instead.Source: From registration records (WHOIS / RDAP archive, who.is)
Nameservers: Amazon Route 53Sep 29, 2023 – Aug 2, 2025Registration records listed Amazon Route 53 nameservers (ns-1222.awsdns-24.org, ns-1555.awsdns-02.co.uk, ns-67.awsdns-08.com…) for csoonline.com from Sep 29, 2023 to Aug 2, 2025.Source: From registration records (WHOIS / RDAP archive, who.is)
DNS moved to Amazon Route 53Sep 29, 2023csoonline.com's nameservers moved from pcworld.com, pnap.net to Amazon Route 53 between Aug 25, 2023 and Sep 29, 2023. Last seen at pcworld.com, pnap.net: Aug 25, 2023 (registration record). First seen at Amazon Route 53: Sep 29, 2023 (registration record).Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Nameservers: CloudflareSep 2, 2025 – May 14, 2026Registration records listed Cloudflare nameservers (boyd.ns.cloudflare.com, kara.ns.cloudflare.com) for csoonline.com from Sep 2, 2025 to May 14, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
DNS moved to CloudflareSep 2, 2025csoonline.com's nameservers moved from Amazon Route 53 to Cloudflare between Aug 2, 2025 and Sep 2, 2025. Last seen at Amazon Route 53: Aug 2, 2025 (registration record). First seen at Cloudflare: Sep 2, 2025 (registration record).Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Seen in the .com zone fileSep 8, 2026 – Oct 10, 2026 (latest)First seen in the .com zone file records AboutUs holds on Sep 8, 2026; latest sighting Oct 10, 2026. Nameservers on Oct 10, 2026: elle.ns.cloudflare.com, michael.ns.cloudflare.com.Source: ICANN CZDS zone file, snapshot Oct 10, 2026
Nameservers changedSep 12, 2026The nameservers listed for csoonline.com changed in the zone file on Sep 12, 2026.Source: ICANN CZDS zone file, snapshot Oct 10, 2026
Google Trust Services
Apr 7, 2026 – Oct 27, 2026
Google Trust Services issued 26 certificates for csoonline.com from Apr 7, 2026, the latest valid until Nov 2, 2026.
Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Let's EncryptApr 26, 2026 – Oct 27, 2026Let's Encrypt issued 21 certificates for csoonline.com from Apr 26, 2026, the latest valid until Jan 14, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Sectigo LimitedSep 21, 2026 – Oct 27, 2026Sectigo Limited issued 2 certificates for csoonline.com from Sep 21, 2026, the latest valid until Dec 21, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Ownership: The registrant name or organization in the registration record changed; first recorded Sep 4, 2007. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Nov 7, 2007Ownership: The registrant name or organization in the registration record changed; first recorded Nov 7, 2007. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Dec 19, 2011Registrar: Registrar MarkMonitor, Inc. (IANA 292) in the registration data recorded on Dec 19, 2011.Source: WHOIS / RDAP archive (who.is)
Jan 7, 2012 – Oct 23, 2013Registrar: Registrar Markmonitor.com in the WHOIS and RDAP records held for csoonline.com, from Jan 7, 2012 to Oct 23, 2013.Source: WHOIS / RDAP archive (who.is)
Oct 18, 2013 – Mar 27, 2015Zone file: MarkMonitor (ns1.markmonitor.com, ns2.markmonitor.com, ns3.markmonitor.com…) were the nameservers listed for csoonline.com at every ICANN zone-file snapshot AboutUs holds from Oct 18, 2013 to Mar 27, 2015 (snapshots exist for only part of 2013–2018).Source: ICANN zone-file snapshots, 2013–2018 (legacy archive)
Apr 4, 2014AboutUs record: An AboutUs wiki page described csoonline.com from Apr 4, 2014 to Apr 4, 2014 (1 edit).Source: AboutUs wiki archive, 2006–2023
Sep 23, 2015 – Apr 3, 2018Zone file: pcworld.com, pnap.net (ns-a.pnap.net, ns-b.pnap.net, ns-c.pnap.net…) were the nameservers listed for csoonline.com at every ICANN zone-file snapshot AboutUs holds from Sep 23, 2015 to Apr 3, 2018 (snapshots exist for only part of 2013–2018).Source: ICANN zone-file snapshots, 2013–2018 (legacy archive)
Sep 23, 2015Zone file: csoonline.com's nameservers moved from MarkMonitor to pcworld.com, pnap.net at some point between Mar 27, 2015 and Sep 23, 2015. Last seen at MarkMonitor: Mar 27, 2015 (ICANN zone-file snapshot). First seen at pcworld.com, pnap.net: Sep 23, 2015 (ICANN zone-file snapshot). AboutUs holds no nameserver records for the 6 months in between, so the date of the move is not known more closely.Source: Derived from the nameserver records on this lifeline (ICANN zone-file snapshot → ICANN zone-file snapshot)
Jul 10, 2016 – May 14, 2026Registrar: Registrar MarkMonitor, Inc. (IANA 292) in the WHOIS and RDAP records held for csoonline.com, from Jul 10, 2016 to May 14, 2026.Source: WHOIS / RDAP archive (who.is)
Apr 4, 2018 – Aug 25, 2023Zone file: Registration records listed pcworld.com, pnap.net nameservers (ns-a.pnap.net, ns-b.pnap.net, ns-c.pnap.net…) for csoonline.com from Apr 4, 2018 to Aug 25, 2023. Days a zone file covers are shown from the zone file instead.Source: From registration records (WHOIS / RDAP archive, who.is)
Sep 29, 2023 – Aug 2, 2025Zone file: Registration records listed Amazon Route 53 nameservers (ns-1222.awsdns-24.org, ns-1555.awsdns-02.co.uk, ns-67.awsdns-08.com…) for csoonline.com from Sep 29, 2023 to Aug 2, 2025.Source: From registration records (WHOIS / RDAP archive, who.is)
Sep 29, 2023Zone file: csoonline.com's nameservers moved from pcworld.com, pnap.net to Amazon Route 53 between Aug 25, 2023 and Sep 29, 2023. Last seen at pcworld.com, pnap.net: Aug 25, 2023 (registration record). First seen at Amazon Route 53: Sep 29, 2023 (registration record).Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Jun 23, 2025 – Oct 27, 2026Certificate: Amazon issued 12 certificates for csoonline.com from Jun 23, 2025, the latest valid until Apr 6, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Sep 2, 2025 – May 14, 2026Zone file: Registration records listed Cloudflare nameservers (boyd.ns.cloudflare.com, kara.ns.cloudflare.com) for csoonline.com from Sep 2, 2025 to May 14, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Sep 2, 2025Zone file: csoonline.com's nameservers moved from Amazon Route 53 to Cloudflare between Aug 2, 2025 and Sep 2, 2025. Last seen at Amazon Route 53: Aug 2, 2025 (registration record). First seen at Cloudflare: Sep 2, 2025 (registration record).Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Apr 7, 2026 – Oct 27, 2026Certificate: Google Trust Services issued 26 certificates for csoonline.com from Apr 7, 2026, the latest valid until Nov 2, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Apr 26, 2026 – Oct 27, 2026Certificate: Let's Encrypt issued 21 certificates for csoonline.com from Apr 26, 2026, the latest valid until Jan 14, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jun 22, 2026 – Sep 18, 2026AboutUs record: Authority and Safety last refreshed Sep 18, 2026.Source: AboutUs checks
Sep 8, 2026 – Oct 10, 2026Zone file: First seen in the .com zone file records AboutUs holds on Sep 8, 2026; latest sighting Oct 10, 2026. Nameservers on Oct 10, 2026: elle.ns.cloudflare.com, michael.ns.cloudflare.com.Source: ICANN CZDS zone file, snapshot Oct 10, 2026
Sep 12, 2026Zone file: The nameservers listed for csoonline.com changed in the zone file on Sep 12, 2026.Source: ICANN CZDS zone file, snapshot Oct 10, 2026
Sep 21, 2026 – Oct 27, 2026Certificate: Sectigo Limited issued 2 certificates for csoonline.com from Sep 21, 2026, the latest valid until Dec 21, 2026.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Registered 2002 · site is live · HTTPS valid
CSO Online publishes security news and analysis for chief security officers and enterprise security professionals.
✓ domain continuity 24 years registered✓ live verified Oct 27, 2026
Safety evidence
No unexpired threat-feed result; name-similarity check available (recorded about 39 days ago); 3/3 transport and email checks available (oldest recorded about 39 days ago). This is evidence coverage, not a probability that a website is safe.
No caution flags in the available scoring observations; this is not a complete safety assessment