HOW.IS
?

How is si.edu?

Not sure yet risk 10/100

On no blocklists we checked, valid HTTPS, the site answered 403 in 86 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 si.edu looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
403
86 ms
HTTPS
130 d
left on a Sectigo Limited certificate
Age
?
creation date not reported
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records5 record types
A160.111.244.22
MX0 si-edu.mail.protection.outlook.com
NSa24-67.akam.net
a28-65.akam.net
a9-64.akam.net
a1-88.akam.net
a11-67.akam.net
a26-66.akam.net
TXTgoogle-site-verification=9-OyClmReEWU6t3ri7R65zaHcE5ONk80xgeIHMjgg08
d2c638e312f5d2bf17a1c5295c39c1b51200c5caff4fafe25ac4f7345d4825aa
v=spf1 ip4:160.111.0.0/16 ip4:67.231.156.100 ip4:67.231.148.101 include:spf1.si.edu include:spf.protection.outlook.com include:mailsenders.netsuite.com -all
f625192959685de445110b63c95ea6f12e17d96e36e9c3e9e0a938c30a4f43ba
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Foxit-domain-verification=90c4cab4414ce9a2004043298dd584ce
D9Pafp4mPMV7Vt+wH+GSYi35FnsBm9zZQA6TLxStwyHV3JFiCPPQGVSJM7UzuvWz/KrphLEsXbc/bs5vKq+iHQ==
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google-site-verification=h1dnhf4Bz-gK562okiF7P9C6hy5xTOc_7v-4ChAOpHo
openai-domain-verification=dv-eu9pCkdZuzJSXWszEh1cs3BG
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3e449f3017316ed138f1d4a6d4be9346a440a6100bb1f1e749992ae4430a7e74
onetrust-domain-verification=733d52d8e41444d097693c749e597ec9
31802817b6579c3d802ca2f1680d394b657eb4788178951026ace15baafb5588
airtable-verification=ca50c9e185a411df32401a63a5457137
atlassian-domain-verification=/lJYot74zjF1VwfCEfyelSmp2V3z5QnHGSWtBhaZzLjy3KajAZuREvkSONV5/oY5
docusign=1c9206b6-fcd1-4754-8bb5-dc9f864d2d2e
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jamf-site-verification=_2xGbG2MJiUanzZxmwyiBA
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canva-site-verification=_s6Cq2oLPbhyDq31iu-b-A
docusign=13c4cb8d-4a47-4283-811e-e667bdd84098
adobe-idp-site-verification=ebf44aa1f4d5c71b36a262511b68415832b6f2ad1b7411c528806154df4cc7a6
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pardot980712=40b77e6a8c3cb064ca443f8d3483406a462ed6e8096c597515102540924fa4ed
7d4550321c0161253c3ea5ccec6c837f8bcf7be735038aa9f653a72d98eec4bc
v=spf2.0/pra ?all
airtable-verification=3f1db8793cf1be25596af7e99e060d41
b3885056fb9ee4649ca08b2d7f5aee42ad8524f090e1d4bc1ebf388f41695af4
apple-domain-verification=OQGHn6kF8gOnAiWs
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atlassian-domain-verification=WsqpJRrIShm2l9mzMRIOQjdSiHChgFqqfOMIUH4B3EDLiaodZLfVZsitwXvvOuzo
b81949f9493326bea1ceae862c879b1a6688f02762ade1c2211702ebb1d5af05
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asv=84f6dfbd71
CAA{'type': 'CAA', 'issue': 'sectigo.com', 'critical': 0}
{'type': 'CAA', 'issue': 'awstrust.com', 'critical': 0}
{'type': 'CAA', 'issue': 'pki.goog; cansignhttpexchanges=yes', 'critical': 0}
{'type': 'CAA', 'issue': 'letsencrypt.org', 'critical': 0}
{'type': 'CAA', 'issue': 'amazonaws.com', 'critical': 0}
{'type': 'CAA', 'issue': 'amazontrust.com', 'critical': 0}
{'type': 'CAA', 'issue': 'ssl.com', 'critical': 0}
{'type': 'CAA', 'issue': 'digicert.com', 'critical': 0}
{'type': 'CAA', 'issue': 'amazon.com', 'critical': 0}
Registrationregistrar not reported
HTTPS certificate130 days left
validyes
issuerSectigo Limited
covers*.si.edu, si.edu
protocolTLSv1.3
issued 2026-08-24expires 2027-03-10
DNSSECsecure

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

. → edu → si.edu
Email authenticationexcellent
SPFpass v=spf1 ip4:160.111.0.0/16 ip4:67.231.156.100 ip4:67.231.148.101 include:spf1.si.edu include:spf.protection.outlook.com include:mailsenders.netsuite.com -all
DMARCpass policy reject
DKIMfound: default, selector1, k1, s1, s2

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

Security scoregrade B · 160/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
45/45missing: 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 · 5 lookups
SURBL MultidomainURIBL MultidomainSpamCop160.111.244.22Barracuda160.111.244.22UCEPROTECT Level 1160.111.244.22

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=si.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=si.edu"

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

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

Watch si.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