Verifying against the live site and live WHOIS/DNS…
Common questions
Is postcarbon.org 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 postcarbon.org?
Nobody has completed AboutUs's owner verification for postcarbon.org. That's true of most sites here — it isn't itself a warning sign.
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Lifeline · postcarbon.org over time
Checked in the last 30 daysOlder, dated recordFrom registration records
Registered 23 years ago · on AboutUs since 2006 · one registrar since Sep 26, 2016 · no ownership change on record since 2016 · last checked Aug 23, 2026.
Registration
RegisteredMay 8, 2003postcarbon.org was registered on May 8, 2003.Source: RDAP, fetched Aug 23, 2026
AboutUs record
AboutUs wiki pageAboutUs wiki pageJun 21, 2006 – Nov 7, 2013An AboutUs wiki page described postcarbon.org from Jun 21, 2006 to Nov 7, 2013 (4 edits).Source: AboutUs wiki archive, 2006–2023
Registrar
GoDaddy.com, LLCGoDaddy.com, LLCSep 26, 2016 – Sep 29, 2026 (latest)Registrar GoDaddy.com, LLC (IANA 146) in the registration data recorded, first on Sep 26, 2016 and most recently on Sep 29, 2026.Source: RDAP, fetched Aug 23, 2026
Ownership
Ownership recordsSep 26, 2016 – Jun 29, 2026Registration records for postcarbon.org are held from Sep 26, 2016 to Jun 29, 2026 (65 records). None shows a change of registrant. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
No ownership changes recorded, 2016–2026
Zone file
No nameserver records held, Sep 2016 – Nov 2017Nameservers: postcarbon.comSep 26, 2016Registration records listed postcarbon.com nameservers (ns1.postcarbon.com, ns2.postcarbon.com) for postcarbon.org from Sep 26, 2016 to Sep 26, 2016.Source: From registration records (WHOIS / RDAP archive, who.is)
Certificate
Let's EncryptMar 30, 2026 – Oct 26, 2026Let's Encrypt issued 21 certificates for postcarbon.org from Mar 30, 2026, the latest valid until Jan 23, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)Certificate from Google Trust Services
20052010201520202025Apr ’26← last 12 months, drawn wider
Every dated fact on this lifeline (13)
May 8, 2003Registration: postcarbon.org was registered on May 8, 2003.Source: RDAP, fetched Aug 23, 2026
Jun 21, 2006 – Nov 7, 2013AboutUs record: An AboutUs wiki page described postcarbon.org from Jun 21, 2006 to Nov 7, 2013 (4 edits).Source: AboutUs wiki archive, 2006–2023
Jul 1, 2006AboutUs record: “The mission of Post Carbon Institute is to assist in the effort to Relocalize communities and adapt to an energy constrained world.”Source: AboutUs wiki archive, 2006
Sep 26, 2016 – Sep 29, 2026Registrar: Registrar GoDaddy.com, LLC (IANA 146) in the registration data recorded, first on Sep 26, 2016 and most recently on Sep 29, 2026.Source: RDAP, fetched Aug 23, 2026
Sep 26, 2016 – Jun 29, 2026Ownership: Registration records for postcarbon.org are held from Sep 26, 2016 to Jun 29, 2026 (65 records). None shows a change of registrant. Privacy-service and redaction changes are not counted.Source: WHOIS / RDAP archive (who.is); counted by registrant name and organization only
Sep 26, 2016Zone file: Registration records listed postcarbon.com nameservers (ns1.postcarbon.com, ns2.postcarbon.com) for postcarbon.org from Sep 26, 2016 to Sep 26, 2016.
Said about itself in 2006
Jul 1, 2006
“The mission of Post Carbon Institute is to assist in the effort to Relocalize communities and adapt to an energy constrained world.”
Source: AboutUs wiki archive, 2006
Current AboutUs recordJul 4, 2026 – Aug 23, 2026 (latest)Authority and Safety last refreshed Aug 23, 2026.Source: AboutUs checks
Nameservers: GoDaddy
Nameservers: GoDaddyNov 20, 2017 – May 8, 2024Registration records listed GoDaddy nameservers (ns57.domaincontrol.com, ns58.domaincontrol.com) for postcarbon.org from Nov 20, 2017 to May 8, 2024.Source: From registration records (WHOIS / RDAP archive, who.is)
DNS moved to GoDaddyNov 20, 2017postcarbon.org's nameservers moved from postcarbon.com to GoDaddy at some point between Sep 26, 2016 and Nov 20, 2017. Last seen at postcarbon.com: Sep 26, 2016 (registration record). First seen at GoDaddy: Nov 20, 2017 (registration record). AboutUs holds no nameserver records for the 14 months 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)
Nameservers: CloudflareNameservers: CloudflareOct 15, 2024 – Jun 29, 2026Registration records listed Cloudflare nameservers (chloe.ns.cloudflare.com, elmo.ns.cloudflare.com) for postcarbon.org from Oct 15, 2024 to Jun 29, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
DNS moved to CloudflareOct 15, 2024postcarbon.org's nameservers moved from GoDaddy to Cloudflare at some point between May 8, 2024 and Oct 15, 2024. Last seen at GoDaddy: May 8, 2024 (registration record). First seen at Cloudflare: Oct 15, 2024 (registration record). AboutUs holds no nameserver records for the 5 months 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)
Aug 28, 2026
Google Trust Services certificate valid Aug 28, 2026 to Nov 26, 2026; the date it was observed was not recorded.
Source: TLS check (observation date not recorded)
Source: From registration records (WHOIS / RDAP archive, who.is)
Nov 20, 2017 – May 8, 2024Zone file: Registration records listed GoDaddy nameservers (ns57.domaincontrol.com, ns58.domaincontrol.com) for postcarbon.org from Nov 20, 2017 to May 8, 2024.Source: From registration records (WHOIS / RDAP archive, who.is)
Nov 20, 2017Zone file: postcarbon.org's nameservers moved from postcarbon.com to GoDaddy at some point between Sep 26, 2016 and Nov 20, 2017. Last seen at postcarbon.com: Sep 26, 2016 (registration record). First seen at GoDaddy: Nov 20, 2017 (registration record). AboutUs holds no nameserver records for the 14 months 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)
Oct 15, 2024 – Jun 29, 2026Zone file: Registration records listed Cloudflare nameservers (chloe.ns.cloudflare.com, elmo.ns.cloudflare.com) for postcarbon.org from Oct 15, 2024 to Jun 29, 2026.Source: From registration records (WHOIS / RDAP archive, who.is)
Oct 15, 2024Zone file: postcarbon.org's nameservers moved from GoDaddy to Cloudflare at some point between May 8, 2024 and Oct 15, 2024. Last seen at GoDaddy: May 8, 2024 (registration record). First seen at Cloudflare: Oct 15, 2024 (registration record). AboutUs holds no nameserver records for the 5 months 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)
Mar 30, 2026 – Oct 26, 2026Certificate: Let's Encrypt issued 21 certificates for postcarbon.org from Mar 30, 2026, the latest valid until Jan 23, 2027.Source: Certificate Transparency logs (AboutUs's own certificate-log reader)
Jul 4, 2026 – Aug 23, 2026AboutUs record: Authority and Safety last refreshed Aug 23, 2026.Source: AboutUs checks
Aug 28, 2026Certificate: Google Trust Services certificate valid Aug 28, 2026 to Nov 26, 2026; the date it was observed was not recorded.Source: TLS check (observation date not recorded)
3 of 4 safety checks passed (Oct 26, 2026).
Registered 2003 · site is live · HTTPS valid
PostCarbon.org institution for sustainability of economic & environment crisis
Post Carbon Institute is a research and education organization based in Sebastopol, California that develops strategies to help communities adapt to energy constraints and reduce dependence on fossil fuels. It offers research, tools, and education focused on "Relocalization"—rebuilding local food and energy production, local economies, and community resilience. The organization emerged from concerns about the environmental and economic risks of global reliance on cheap energy.
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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 May 8, 2003 — 23 years old.
latest result
Registrar on record: GoDaddy.com, LLC — unchanged since AboutUs began tracking (Aug 29, 2026).
latest result
HTTPS request succeeded for www.postcarbon.org.
checked Sep 30, 2026
The site names Post Carbon Institute as the organisation behind it.
checked Sep 30, 2026
The live front page reads as a non-profit, association or religious site that is funded by donations or members, mainly for a general audience.
Authority 62/100— ahead of 62% of the August 2026 scored sampleClear
Why this authority score
62 is a percentile: higher than 62% of sites we score.
How it's calculated
Prominence (Tranco rank #242,900)+6
Verified continuity: 23.5 years (RDAP registration)+10
Identity corroboration (capped)+4
Security & email hygiene+3
Calibration adjustment (published map)+9
Model score: 32/99 — what these reason lines add up to.
Published Authority (percentile): 62/100 — this site's rank against the August 2026 scored sample. Public Authority is capped at 99.
What postcarbon.org 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
The mission of Post Carbon Institute is to assist in the effort to Relocalize communities and adapt to an energy constrained world.
Site history
Dated record — historical facts always carry their date.
✓ domain continuity 23 years registered✓ live verified Oct 26, 2026
Safety evidence
No unexpired threat-feed result; name-similarity check available (recorded about 64 days ago); 3/3 transport and email checks available (oldest recorded about 64 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