How is quizlet.com?

Looks fine risk 0/100

Registered 22 years ago, on no blocklists we checked, valid HTTPS, the site answered 403 in 36 ms.

Why

02050100

finecarefulhigh risk

·Nothing in the checks added risk.

Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

403

36 ms

HTTPS

73 d

left on a Let's Encrypt certificate

Age

22 years

registered 2004-07-15

Blocklists

listings across 4 lists; 1 did not answer

Everything we looked at

DNS records4 record types

A	104.16.134.27 104.16.133.27
MX	10 aspmx.l.google.com 40 aspmx2.googlemail.com 60 aspmx4.googlemail.com 30 alt2.aspmx.l.google.com 50 aspmx3.googlemail.com 20 alt1.aspmx.l.google.com 70 aspmx5.googlemail.com
NS	lily.ns.cloudflare.com ian.ns.cloudflare.com
TXT	docusign=a6f2c83c-9542-4ba7-92e3-032b45a00375 v=spf1 include:spf.mtasv.net include:_spf.google.com include:sendgrid.net include:mail.zendesk.com include:_spf.salesforce.com ~all MS=ms29141506 onetrust-domain-verification=7316088ca8db44f78ca82d9e961f6442 atlassian-domain-verification=RY6sTRPfyrQlcq2vgiA3xPplUkOM9JLXJSDEQotm9vlyY86HuuDBGaGDyLm9oTNF google-site-verification=5qTpwRH3290N26h2y-Dt-SOmOyX8xLramCneO4W9nDs verification_token=hwfem4LxsGXoCR8htJxKqQI2W PAEZFEC4AVFC77KOVF1R0H57BRTMST936SZT1YXT 6bc7fbl8y9h6lng2n9mfymp16dy63g5s onetrust-domain-verification=31c369ac7a3544d19c07ea059d09b5f3 openai-domain-verification=dv-5Nx1YJVH5ae1OqCzL1NiNOu0 24F3373645 facebook-domain-verification=pzag31nnjljvy81xhps4rggqtj46rq pinterest-site-verification=ea81483d36f8c1be6f86693a81004261 cursor-domain-verification-nvvmrz=MJvAnXKyNFtJKJABZah0XyVgc google-site-verification=w1N3KNUCtJ6ovW-SihpCFUCwQqB_mC7HMMn2FDeig48 linear-domain-verification=c63cnkxcepz3 google-site-verification=W5dcXTOxPUzVvjBMgdJzZSMSebqrWo0O6CBV0FN1dhY anthropic-domain-verification-c3qp9g=07K3uDxfCV06dDvwrJXNZeulX hcp-domain-verification=0610f95c7b0e248dd930b7076e658fa93c1a08ccfa5f91e96b612919e6ef5807 google-site-verification=zwWiKvbXdW7mObtno1aea-OcQHXpmaZ2CvcW3qclYnA 762642896-4167472 apple-domain-verification=GhqRH5BdB8mVkDUq K6b3CtLBfcqpRDNJfg7WcyP9qg atlassian-domain-verification=plVFZkxuXPVmwzDvcpY5wv9jzzqQtxQtByhFAEdY+P7nj9p8snaZ075RZ/N1leeb _c6ifay1uuzwpf3c6q917aojjdd6p1ea

RegistrationGoDaddy.com, LLC

registrar	GoDaddy.com, LLC
registered	2004-07-15
expires	2029-07-15
last changed	2026-07-16
nameservers	cns1.quizlet.com cns2.quizlet.com
status	client delete prohibited client renew prohibited client transfer prohibited client update prohibited

registered 2004-07-15expires 2029-07-15

HTTPS certificate73 days left

valid	yes
issuer	Let's Encrypt
covers	ablink.account.quizlet.com, ablink.lifecycle.quizlet.com, ablink.newsletter.quizlet.com, abmail.subscriptions.quizlet.com, quizlet.com
protocol	TLSv1.3

issued 2026-10-15expires 2027-01-13

DNSSECsecure

Domain is properly signed — chain validated by an independent validating resolver

. → com → quizlet.com

Email authenticationexcellent

SPF	pass `v=spf1 include:spf.mtasv.net include:_spf.google.com include:sendgrid.net include:mail.zendesk.com include:_spf.salesforce.com ~all`
DMARC	pass policy reject
DKIM	found: google, s1, s2

Whether mail claiming to be from this domain can be checked as genuine.

Security scoregrade B · 155/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

30/45missing: CAA Records, DKIM Presence

Advanced Security

20/25missing: IPv6 Support

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 8 lookups

SURBL MultidomainURIBL MultidomainSpamCop104.16.133.27Barracuda104.16.133.27UCEPROTECT Level 1104.16.133.27SpamCop104.16.134.27Barracuda104.16.134.27UCEPROTECT Level 1104.16.134.27

Green: clean. Red: listed. Grey: the list did not answer.

Ask it yourself

Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.

curl "https://how.is/v1/domain/trust?domain=quizlet.com" \ -H "Authorization: Bearer $HOWIS_KEY" # or pay per call in USDC (x402), no key: the 402 tells your agent the price curl -i "https://how.is/v1/domain/profile?domain=quizlet.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on quizlet.com. Reference: /llms.txt.

IPv6. Does quizlet.com work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.

Watch quizlet.com. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.

Watch — $1 / 30 days