HOW.IS
?

How is calculator.net?

Looks fine risk 0/100

Registered 28 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 103 ms.

Why

02050100
finecarefulhigh risk
  • ·Nothing in the checks added risk.

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

How calculator.net looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
200
103 ms · ends at www.calculator.net
HTTPS
114 d
left on a GoDaddy.com certificate
Age
28 years
registered 1998-07-07
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records4 record types
A69.10.42.201
MX10 mailstore1.secureserver.net
0 smtp.secureserver.net
NSpdns13.domaincontrol.com
pdns14.domaincontrol.com
TXTv=spf1 ip4:69.10.42.201 include:_spf.google.com ~all
RegistrationGoDaddy.com, LLC
registrarGoDaddy.com, LLC
registered1998-07-07
expires2031-11-01
last changed2026-10-09
nameserverspdns13.domaincontrol.com
pdns14.domaincontrol.com
statusclient delete prohibited
client renew prohibited
client transfer prohibited
client update prohibited
registered 1998-07-07expires 2031-11-01
HTTPS certificate114 days left
validyes
issuerGoDaddy.com
covers*.calculator.net, calculator.net
protocolTLSv1.3
issued 2026-08-06expires 2027-02-20
DNSSECinsecure

Domain is not signed with DNSSEC

. → net → calculator.net
Email authenticationpoor
SPFpass v=spf1 ip4:69.10.42.201 include:_spf.google.com ~all
DMARCnone
DKIMnone of 1 common selectors

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

Security scoregrade C · 140/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
15/45missing: CAA Records, DMARC Record, DKIM Presence
Advanced Security
20/25missing: IPv6 Support
Domain Reputation
50/50
Threat Detection
45/45missing: Domain Age Check
Blocklists0 listings · 5 lookups
SURBL MultidomainURIBL MultidomainSpamCop69.10.42.201Barracuda69.10.42.201UCEPROTECT Level 169.10.42.201

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=calculator.net" \ -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=calculator.net"

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

Watch calculator.net. 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