HOW.IS
?

How is duke.edu?

Not sure yet risk 10/100

On no blocklists we checked, valid HTTPS, the site answered 200 in 284 ms.

Why

02050100
finecarefulhigh risk
  • +10Could not read the domain's registration record.
  • ·Could not check registration; retry before trusting this domain.

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

How duke.edu looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
200
284 ms · ends at www.duke.edu
HTTPS
5 d
left on a Internet2 certificate
Age
?
creation date not reported
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records4 record types
A152.3.70.87
152.3.72.243
MX10 duke-edu.mail.protection.outlook.com
NSdns-auth-01.oit.duke.edu
dns-auth-02.oit.duke.edu
dns-nc1-01.oit.duke.edu
TXTgoogle-site-verification=fohuGSMCupMBfLvJ-OqvhaNOUrd4-VJzOA_hUjfM0GQ
facebook-domain-verification=z3gz759ai6md22t5oavjekfy06n11r
ciscocidomainverification=2d1dd96a4eb257ed827359fa052171ab2c46910868187a2bc9365f496904b651
88n3v2rofr6e5as8nu1tfnq6mg
anthropic-domain-verification-z8t79x=2ToUeCCwAOnrDzSEM9VxiJHeX
airtable-verification=776ba9943f279be2814d0f5b7bf99b5c
adobe-sign-verification=8c1cf31e238f6042bd9a6e8424ecd7af
google-site-verification=Cx538Bo1iba_0Qw1ca-yfo2f0E50HuiB5AzF1oasBOc
airtable-verification=979478a7fc8cd2102187835add26f443
coursera-domain-verification=dOLNWQ6sTftvfDnosc2HzaPlo9Fq2JKvoTNk0TrDuQdAoJlCqcvFEumPwWJgHVfn
e2ma-verification=e8qeb
iContact1673295
iContact1788229
adobe-idp-site-verification=76438831-136f-42eb-8467-627bcd13bec6
e2ma-verification=yq0fb
d365mktkey=DVSS3DGKRQNGACvj4bqW577P8t7hrVqGDWyDQzJFAtwx
d365mktkey=9UxytuxfXT7fQ5X2Wqo5UgHrC9MfXzESiUXsydjgVbkx
VqIKTw/sDnE4e+9lXPalJqYaTtomECjG0+6XKvd2Nhfkaw8aAfgvcZjlAshHEjspbTHBtw4hhkk5X1ITTvdWxw==
MS=ms29427067
yahoo-verification-key=m1mvmfsoVrobVlqVWZx2Cp3YBfQa4w4jqe7f1pXZsdg=
google-site-verification=5TXsU4v41p3-uJbMWepQdYbg8ydDm7pZqZpyL43nBec
1password-site-verification=Y3VALDXXNFEVBGZLI56XBT6MKY
atlassian-sending-domain-verification=3e62be3c-15a0-4c29-b220-9228dccda4d6
e2ma-verification=spmfb
iContact1742283
e2ma-verification=tqqfb
e2ma-verification=fu4
e2ma-verification=d3hfb
airtable-verification=7d15715bf3281d4f6ab41a64ff551dd6
google-site-verification=VxNOqXRiTfBZEja2TbHMcwM3i0FcGUitTMxTa9CdXAg
webexdomainverification.DW7A=3d54276f-7c3e-4b36-82cb-f9283bd66232
e2ma-verification=vsg
e2ma-verification=khq
00D1I000000nhfJ=1TBcx00000002bK
amazonses:kvjwShx2VuYQZKM31gjyJ9z5IWLmFmkF2BSfMHV5j2I=
e2ma-verification=9bjib
e2ma-verification=sqqfb
iContact1567195
google-site-verification=WyhytImncSxgmBWxa1o1_nGcNS2LuzeYvzApLAE2qVA
v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
asv=f0db2381d25189259bae9b4f5b96470a
atlassian-domain-verification=JNWA1j8qak7X8iJmucR4XqAsQOwMPSakfcNzpTn0Jc7b8aFxXcjK9cJay68Xqn9b
google-site-verification=VTUhJp3AMqjMfqUIY6tdlBsNKZLr-E_D0oN0Z96EW_E
e2ma-verification=rhq
jamf-site-verification=2LbyJCbxBoCYL2FzaVVnoA
e2ma-verification=ru6fb
e2ma-verification=jv3cb
webexdomainverification.DW7B=b34c0222-460e-4621-bb5b-7ce6ee15ead2
e2ma-verification=qqqfb
e2ma-verification=chxfb
iContact1560489
iContact1053803
e2ma-verification=fbqeb
e2ma-verification=0dhfb
91TR4AEZ87EVJCSEOKTFQJ1KGWHDG7PQ4T52XL7YQ
e2ma-verification=984fb
e2ma-verification=wc0fb
Registrationregistrar not reported
HTTPS certificate5 days left
validyes
issuerInternet2
coversduke.edu, www.duke.edu
protocolTLSv1.3
issued 2026-04-22expires 2026-11-06
DNSSECinsecure

Domain is not signed with DNSSEC

. → edu → duke.edu
Email authenticationexcellent
SPFpass v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all
DMARCpass policy quarantine
DKIMfound: selector1, selector2, s1, s2

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

Security scoregrade B · 145/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
30/45missing: CAA Records, DKIM Presence
Advanced Security
10/25missing: Mail Server Configuration, SOA Record Configuration, IPv6 Support
Domain Reputation
50/50
Threat Detection
45/45missing: Domain Age Check
Blocklists0 listings · 8 lookups
SURBL MultidomainURIBL MultidomainSpamCop152.3.70.87Barracuda152.3.70.87UCEPROTECT Level 1152.3.70.87SpamCop152.3.72.243Barracuda152.3.72.243UCEPROTECT Level 1152.3.72.243

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=duke.edu" \ -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=duke.edu"

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

IPv6. IPv6 readiness grade for duke.edu Does duke.edu work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.

Watch duke.edu. 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