HOW.IS
?

How is f5.com?

Looks fine risk 0/100

Registered 30 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 350 ms.

Why

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

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

How f5.com looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
200
350 ms · ends at www.f5.com
HTTPS
43 d
left on a Sectigo Limited certificate
Age
30 years
registered 1996-05-31
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records5 record types
A159.60.134.0
MX10 mx1.hc5801-97.iphmx.com
10 mx2.hc5801-97.iphmx.com
NSpdns151.f5.com
pdns150.f5.com
pdns130.f5.com
pdns131.f5.com
TXTaccess-domain-verification=991a9590d7b277fbfa4447d0a11a82014650d68747b1f81d75cd1a2c235fe4a6
anthropic-domain-verification-2kamjp=ZZuMkVekozcvGxsCWJLdA1eAO
mongodb-site-verification=EGjovmxIH7GXJAXqy2EvL4YAZQYrNeE3
docusign=a0f80b2b-cad3-42fb-bec6-e6abf458700f
google-site-verification=cNGL-u4aLQubC64AY7ijWgQfdQP37Uc0iNF0L9CU-6Q
openai-domain-verification=dv-QGwd5Yv9j18PJqYMjkopiOny
asv=b40190d75de514229e7a1bf7af81f170
dropbox-domain-verification=oj5aqbo1eulz
smartsheet-site-validation=ViznRSiRmJJYL_bUbM12TuSMi223D6i0
v=spf1 ip4:104.219.104.72 ip4:104.219.106.65 ip4:104.219.105.72 ip4:104.219.107.65 exists:%{i}.spf.hc5801-97.iphmx.com include:spf.protection.outlook.com include:mktomail.com include:_spf.salesforce.com -all
jamf-site-verification=YK2eaJK5WmX6OkUBJg-odw
adobe-idp-site-verification=9af818c65525c17f45bb3b16b01b1292a6deed65c3f1f2b5815dc825f9dd58c1
cisco-ci-domain-verification=6a1e8be23a89b503b322d717459a6e8485a5875162146fb1b7516fc42321c295
lucid-verification=58MzWUiZFz40
onetrust-domain-verification=305089a3e57b4f8087cf72e441a0c2c7
MS=ms50853128
docker-verification=b6850f2c-29d1-4ef5-9e84-06517c63b5b7
atlassian-domain-verification=P1MVRYjo3N9ccfO1UcT5dJ6/Kgk15DSGNlWDMwnLtKrkvMEiLeetMyA2eliIKnI1
axios-domain-verification-pzeb04=jH6MgIXTf5a6SQ4sZ3dORRFkI
google-site-verification=nUmUWQAnvixEM-Lopr4DWotRA_VPJXL9YaCvt7e2odU
Dynatrace-site-verification=14970c01-b9a2-4fb0-baa4-3e55421d6198__hjigvhh8rdsjed6p5bbig75qiu
google-site-verification=zIm-_CbdIdyLUQqG3LDYpyo--Hls4FaOjiJHmJ3-Jks
789860b7-c311-4dbb-98a4-0b5e57e5c3fc
google-site-verification=o76ulVr4EPgPrnnF_bbHT1OL-9awsJWyZ9fkXHOL_Ks
h1-domain-verification=jPmdBtyUJoEDgyzigqRQHGsk7mqkne2WHrBJwjFkAfSGKuWg
0ugFx1int1d0kBtTIwKeL+3TA/tpJDPOm6BIWTRhDwKq9sj2Lc1loQ4tH27Da1vtpI1HjBxX2eHtpmEOnTKfPA==
status-page-domain-verification=y2kv019j5p4h
apple-domain-verification=WmWqjjQdNTd8FLj1
amazon-business-verification=668708113d5b9883bcc8f76df5e20f28358a0986927b202c377259e37431ca08
parkable-domain-verification=81BB0RfEy-pskwMf66KW26gEo68UYrZ4uYPpJIiUgoI=
CAA{'type': 'CAA', 'issue': 'amazon.com', 'critical': 0}
{'type': 'CAA', 'iodef': 'mailto:dnsadmin@f5.com', 'critical': 0}
{'type': 'CAA', 'issue': 'letsencrypt.org', 'critical': 0}
{'type': 'CAA', 'issue': 'digicert.com', 'critical': 0}
{'type': 'CAA', 'issue': 'pki.goog', 'critical': 0}
{'type': 'CAA', 'issue': 'sectigo.com', 'critical': 0}
{'type': 'CAA', 'issue': 'comodoca.com', 'critical': 0}
RegistrationCSC Corporate Domains, Inc.
registrarCSC Corporate Domains, Inc.
registered1996-05-31
expires2027-05-30
last changed2026-05-26
nameserverspdns130.f5.com
pdns131.f5.com
pdns150.f5.com
pdns151.f5.com
statusclient transfer prohibited
server delete prohibited
server transfer prohibited
server update prohibited
registered 1996-05-31expires 2027-05-30
HTTPS certificate43 days left
validyes
issuerSectigo Limited
coversf5.com, author65.f5.com, partners.f5.com, techdocs.f5.com, www.f5.com, www.f5.com.cn, www.nginx-cn.net, www.nginx.com
protocolTLSv1.3
issued 2025-11-06expires 2026-12-07
DNSSECinsecure

Domain is not signed with DNSSEC

. → com → f5.com
Email authenticationexcellent
SPFpass v=spf1 ip4:104.219.104.72 ip4:104.219.106.65 ip4:104.219.105.72 ip4:104.219.107.65 exists:%{i}.spf.hc5801-97.iphmx.com include:spf.protection.outlook.com include:mktomail.com include:_spf.salesforce.com -all
DMARCpass policy reject
DKIMfound: selector1, selector2, k1, s1, s2

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

Security scoregrade B · 170/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
45/45missing: 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 MultidomainSpamCop159.60.134.0Barracuda159.60.134.0UCEPROTECT Level 1159.60.134.0

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=f5.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=f5.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on f5.com. Reference: /llms.txt.

Watch f5.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