Registered 1997 · AboutUs could not get a response over HTTPS when it checked (Oct 26, 2026)
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Who owns phptr.com?
Nobody has completed AboutUs's owner verification for phptr.com. That's true of most sites here — it isn't itself a warning sign.
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Phptr.com is a guide to Prentice Hall publications for IT professionals
ABOUT PRENTICE HALL PTR Prentice Hall Professional Technical Reference (PHPTR) is a respected publisher of quality computer science and engineering books and software for technical professionals.
Checked in the last 30 daysOlder, dated recordFrom registration records
Registered 29 years ago · on AboutUs since 2006 · 2 registrar changes since May 17, 2007 · 2 ownership changes since 2007 · last checked Sep 24, 2026.
Registration
RegisteredJul 4, 1997phptr.com was registered on Jul 4, 1997.Source: RDAP, fetched Aug 28, 2026
AboutUs record
AboutUs wiki pageAboutUs wiki pageJun 21, 2006 – Nov 6, 2013An AboutUs wiki page described phptr.com from Jun 21, 2006 to Nov 6, 2013 (3 edits).Source: AboutUs wiki archive, 2006–2023
Registrar
REGISTER.COM, INC.May 17, 2007 – Jul 11, 2007Registrar REGISTER.COM, INC. in the WHOIS and RDAP records held for phptr.com, from May 17, 2007 to Jul 11, 2007.Source: WHOIS / RDAP archive (who.is)CSC CORPORATE DOMAINS, INC.CSC CORPORATE DOMAINS, INC.
Ownership
Ownership recordsMay 17, 2007 – May 15, 2026Registration records for phptr.com are held from May 17, 2007 to May 15, 2026 (93 records). 2 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
Nameservers: pearsontc.comNameservers: pearsontc.comMay 17, 2007 – Oct 17, 2013Registration records listed pearsontc.com nameservers (oldtxdns2.pearsontc.com, usrxdns1.pearsontc.com) for phptr.com from May 17, 2007 to Oct 17, 2013. Days a zone file covers are shown from the zone file instead.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
No certificate recorded yet.
200020102020Jan ’26Oct ’26← last 12 months, drawn wider
Every dated fact on this lifeline (18)
Jul 4, 1997Registration: phptr.com was registered on Jul 4, 1997.Source: RDAP, fetched Aug 28, 2026
Jun 21, 2006 – Nov 6, 2013AboutUs record: An AboutUs wiki page described phptr.com from Jun 21, 2006 to Nov 6, 2013 (3 edits).Source: AboutUs wiki archive, 2006–2023
Jul 1, 2006AboutUs record: “Prentice Hall Professional Technical Reference (PHPTR) is a respected publisher of quality computer science and engineering books and software for technical professionals. It is a unit of Pearson Technology Group, the w…”Source: AboutUs wiki archive, 2006
May 17, 2007 – Jul 11, 2007Registrar: Registrar REGISTER.COM, INC. in the WHOIS and RDAP records held for phptr.com, from May 17, 2007 to Jul 11, 2007.Source: WHOIS / RDAP archive (who.is)
May 17, 2007 – May 15, 2026Ownership: Registration records for phptr.com are held from May 17, 2007 to May 15, 2026 (93 records). 2 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 17, 2007 – Oct 17, 2013
Said about itself in 2006
Jul 1, 2006
“Prentice Hall Professional Technical Reference (PHPTR) is a respected publisher of quality computer science and engineering books and software for technical professionals. It is a unit of Pearson Technology Group, the w…”
Source: AboutUs wiki archive, 2006
Current AboutUs recordJun 22, 2026 – Aug 28, 2026 (latest)Authority and Safety last refreshed Aug 28, 2026.Source: AboutUs checks
Aug 30, 2007 – May 15, 2020
Registrar CSC CORPORATE DOMAINS, INC. (IANA 299) in the WHOIS and RDAP records held for phptr.com, from Aug 30, 2007 to May 15, 2020.
Source: WHOIS / RDAP archive (who.is)
NAMECHEAP INCNAMECHEAP INCJul 2, 2020 – Oct 26, 2026 (latest)Registrar NAMECHEAP INC (IANA 1068) in the registration data recorded, first on Jul 2, 2020 and most recently on Oct 26, 2026.Source: RDAP, fetched Aug 28, 2026
Ownership change
Nov 9, 2013
The registrant name or organization in the registration record changed; first recorded Nov 9, 2013. Who it changed to is in the full report.
Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Ownership changeApr 23, 2017The registrant name or organization in the registration record changed; first recorded Apr 23, 2017. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
2 ownership changes, 2007–2026
Nameservers: pearsontc.comOct 18, 2013 – Jun 1, 2014pearsontc.com (oldtxdns2.pearsontc.com, usrxdns1.pearsontc.com) were the nameservers listed for phptr.com at every ICANN zone-file snapshot AboutUs holds from Oct 18, 2013 to Jun 1, 2014 (snapshots exist for only part of 2013–2018).Source: ICANN zone-file snapshots, 2013–2018 (legacy archive)
Nameservers: pearson.comJan 24, 2015 – Apr 3, 2018pearson.com (ns01.pearson.com, ns02.pearson.com, ns03.pearson.com…) were the nameservers listed for phptr.com at every ICANN zone-file snapshot AboutUs holds from Jan 24, 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 pearson.comJan 24, 2015phptr.com's nameservers moved from pearsontc.com to pearson.com at some point between Jun 1, 2014 and Jan 24, 2015. Last seen at pearsontc.com: Jun 1, 2014 (ICANN zone-file snapshot). First seen at pearson.com: Jan 24, 2015 (ICANN zone-file snapshot). AboutUs holds no nameserver records for the 8 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: pearson.comApr 4, 2018 – Nov 30, 2020Registration records listed pearson.com nameservers (ns01.pearson.com, ns02.pearson.com, ns03.pearson.com…) for phptr.com from Apr 4, 2018 to Nov 30, 2020. Days a zone file covers are shown from the zone file instead.Source: From registration records (WHOIS / RDAP archive, who.is)
Nameservers: NamecheapNameservers: NamecheapJan 20, 2021 – May 15, 2026Registration records listed Namecheap nameservers (dns1.registrar-servers.com, dns2.registrar-servers.com) for phptr.com from Jan 20, 2021 to May 15, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
DNS moved to NamecheapJan 20, 2021phptr.com's nameservers moved from pearson.com to Namecheap at some point between Nov 30, 2020 and Jan 20, 2021. Last seen at pearson.com: Nov 30, 2020 (registration record). First seen at Namecheap: Jan 20, 2021 (registration record). AboutUs holds no nameserver records for the 51 days in between, so the date of the move is not known more closely.Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Seen in the .com zone fileSep 8, 2026 – Sep 24, 2026 (latest)First seen in the .com zone file records AboutUs holds on Sep 8, 2026; latest sighting Sep 24, 2026. Nameservers on Sep 24, 2026: dns1.registrar-servers.com, dns2.registrar-servers.com.Source: ICANN CZDS zone file, snapshot Sep 24, 2026
Zone file: Registration records listed pearsontc.com nameservers (oldtxdns2.pearsontc.com, usrxdns1.pearsontc.com) for phptr.com from May 17, 2007 to Oct 17, 2013. Days a zone file covers are shown from the zone file instead.Source: From registration records (WHOIS / RDAP archive, who.is)
Aug 30, 2007 – May 15, 2020Registrar: Registrar CSC CORPORATE DOMAINS, INC. (IANA 299) in the WHOIS and RDAP records held for phptr.com, from Aug 30, 2007 to May 15, 2020.Source: WHOIS / RDAP archive (who.is)
Oct 18, 2013 – Jun 1, 2014Zone file: pearsontc.com (oldtxdns2.pearsontc.com, usrxdns1.pearsontc.com) were the nameservers listed for phptr.com at every ICANN zone-file snapshot AboutUs holds from Oct 18, 2013 to Jun 1, 2014 (snapshots exist for only part of 2013–2018).Source: ICANN zone-file snapshots, 2013–2018 (legacy archive)
Nov 9, 2013Ownership: The registrant name or organization in the registration record changed; first recorded Nov 9, 2013. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Jan 24, 2015 – Apr 3, 2018Zone file: pearson.com (ns01.pearson.com, ns02.pearson.com, ns03.pearson.com…) were the nameservers listed for phptr.com at every ICANN zone-file snapshot AboutUs holds from Jan 24, 2015 to Apr 3, 2018 (snapshots exist for only part of 2013–2018).Source: ICANN zone-file snapshots, 2013–2018 (legacy archive)
Jan 24, 2015Zone file: phptr.com's nameservers moved from pearsontc.com to pearson.com at some point between Jun 1, 2014 and Jan 24, 2015. Last seen at pearsontc.com: Jun 1, 2014 (ICANN zone-file snapshot). First seen at pearson.com: Jan 24, 2015 (ICANN zone-file snapshot). AboutUs holds no nameserver records for the 8 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)
Apr 23, 2017Ownership: The registrant name or organization in the registration record changed; first recorded Apr 23, 2017. Who it changed to is in the full report.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Apr 4, 2018 – Nov 30, 2020Zone file: Registration records listed pearson.com nameservers (ns01.pearson.com, ns02.pearson.com, ns03.pearson.com…) for phptr.com from Apr 4, 2018 to Nov 30, 2020. Days a zone file covers are shown from the zone file instead.Source: From registration records (WHOIS / RDAP archive, who.is)
Jul 2, 2020 – Oct 26, 2026Registrar: Registrar NAMECHEAP INC (IANA 1068) in the registration data recorded, first on Jul 2, 2020 and most recently on Oct 26, 2026.Source: RDAP, fetched Aug 28, 2026
Jan 20, 2021 – May 15, 2026Zone file: Registration records listed Namecheap nameservers (dns1.registrar-servers.com, dns2.registrar-servers.com) for phptr.com from Jan 20, 2021 to May 15, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Jan 20, 2021Zone file: phptr.com's nameservers moved from pearson.com to Namecheap at some point between Nov 30, 2020 and Jan 20, 2021. Last seen at pearson.com: Nov 30, 2020 (registration record). First seen at Namecheap: Jan 20, 2021 (registration record). AboutUs holds no nameserver records for the 51 days in between, so the date of the move is not known more closely.Source: Derived from the nameserver records on this lifeline (registration record → registration record)
Jun 22, 2026 – Aug 28, 2026AboutUs record: Authority and Safety last refreshed Aug 28, 2026.Source: AboutUs checks
Sep 8, 2026 – Sep 24, 2026Zone file: First seen in the .com zone file records AboutUs holds on Sep 8, 2026; latest sighting Sep 24, 2026. Nameservers on Sep 24, 2026: dns1.registrar-servers.com, dns2.registrar-servers.com.Source: ICANN CZDS zone file, snapshot Sep 24, 2026
Automated safety checks
DNS (passed)
HTTPS (failed)
Make sure the site responds over HTTPS with a valid certificate.
AboutUs has not vetted this site. Everything below is what we could measure automatically. Anything you do on the site — paying, sharing personal details, downloading — is between you and the site, not AboutUs.
Current facts
Latest available measurements; dated entries retain their dates. These are measurements, not an endorsement of the site.
latest result
Domain registered Jul 4, 1997 — 29 years old.
latest result
Registrar on record: NameCheap, Inc. — unchanged since AboutUs began tracking (Sep 14, 2026).
checked Sep 30, 2026
The live front page reads as an education or reference site, mainly for students and teachers.
Authority 41/100— ahead of 41% of the August 2026 scored sampleClear
Why this authority score
41 is a percentile: higher than 41% of sites we score.
How it's calculated
Prominence (Tranco rank #629,858)+5
Verified continuity: 29.3 years (RDAP registration)+11
Security & email hygiene+2
Calibration adjustment (published map)+5
Model score: 23/99 — what these reason lines add up to.
Published Authority (percentile): 41/100 — this site's rank against the August 2026 scored sample. Public Authority is capped at 99.
Safety evidence
No unexpired threat-feed result; name-similarity check available (recorded about 58 days ago); 3/3 transport and email checks available (oldest recorded about 58 days ago). This is evidence coverage, not a probability that a website is safe.
What phptr.com said about itself, 2006
Quoted from the site's AboutUs wiki page in each year it changed (1 version). These are the page's own words at the time, not AboutUs's assessment. New words · dropped words
2006
Prentice Hall Professional Technical Reference (PHPTR) is a respected publisher of quality computer science and engineering books and software for technical professionals. It is a unit of Pearson Technology Group, the world's largest provider of consumer and professional computer, information technology, engineering and reference content.
Site history
Dated record — historical facts always carry their date.