HOW.IS
?

How is office365.us?

Be careful risk 20/100

Registered 17 years ago, on no blocklists we checked, no valid HTTPS certificate, the site did not answer (timed out).

Why

02050100
finecarefulhigh risk
  • +20No valid HTTPS certificate.

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

Site
down
timed out
HTTPS
invalid
Connection timed out
Age
17 years
registered 2010-04-19
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records4 record types
A40.66.16.2
131.253.86.150
40.66.16.194
131.253.86.134
131.253.86.166
40.66.16.130
131.253.86.182
NSns2-06.azuregov-dns.us
ns1-06.azuregov-dns.us
ns4-06.azuregov-dns.us
ns3-06.azuregov-dns.us
TXT_mopsvv4q31oqktms1lm7bbe411tii86
CAA{'type': 'CAA', 'iodef': 'mailto:domains@microsoft.com', 'critical': 0}
{'type': 'CAA', 'issue': 'digicert.com', 'critical': 0}
{'type': 'CAA', 'issue': 'microsoft.com', 'critical': 0}
{'type': 'CAA', 'critical': 0, 'contactemail': 'caarecordaware@microsoft.com'}
{'type': 'CAA', 'issue': 'entrust.net', 'critical': 0}
RegistrationCSC Corporate Domains, Inc.
registrarCSC Corporate Domains, Inc.
registered2010-04-19
expires2027-04-18
last changed2026-04-14
nameserversns4-06.azuregov-dns.us
ns3-06.azuregov-dns.us
ns1-06.azuregov-dns.us
ns2-06.azuregov-dns.us
statusclient transfer prohibited
registered 2010-04-19expires 2027-04-18
HTTPS certificatenot valid
validno
problemConnection timed out
DNSSECsecure

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

. → us → office365.us
Email authenticationpoor
SPFnone
DMARCnone
DKIMnone of 1 common selectors

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

Security scoregrade C · 125/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
15/45missing: SPF Record, DMARC Record, DKIM Presence
Advanced Security
5/25missing: Mail Server Configuration, SOA Record Configuration, IPv6 Support
Domain Reputation
50/50
Threat Detection
45/45missing: Domain Age Check
Blocklists0 listings · 17 lookups
SURBL MultidomainURIBL MultidomainSpamCop40.66.16.130Barracuda40.66.16.130UCEPROTECT Level 140.66.16.130SpamCop131.253.86.134Barracuda131.253.86.134UCEPROTECT Level 1131.253.86.134SpamCop131.253.86.182Barracuda131.253.86.182UCEPROTECT Level 1131.253.86.182SpamCop131.253.86.150Barracuda131.253.86.150UCEPROTECT Level 1131.253.86.150SpamCop40.66.16.2Barracuda40.66.16.2UCEPROTECT Level 140.66.16.2

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=office365.us" \ -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=office365.us"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on office365.us. Reference: /llms.txt.

Watch office365.us. 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