How is auth0.com?

Looks fine risk 0/100

Registered 14 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 105 ms.

Why

02050100

finecarefulhigh risk

·Nothing in the checks added risk.

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

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

200

105 ms

HTTPS

82 d

left on a Let's Encrypt certificate

Age

14 years

registered 2012-10-18

Blocklists

listings across 5 lists

Everything we looked at

DNS records5 record types

A	104.18.37.18 172.64.150.238
AAAA	2a06:98c1:310b::6812:2512 2606:4700:4407::ac40:96ee
MX	10 mxa-00553301.gslb.pphosted.com 10 mxb-00553301.gslb.pphosted.com
NS	monroe.ns.cloudflare.com kolton.ns.cloudflare.com
TXT	bugcrowd-verification=0c5422b6d5fc998dd934361620b97993 adobe-idp-site-verification=2ec548128df4fbccb40fa3bd89255013f93dd4e820ccf7827e13a848b9852c68 v=MCPv1; k=ed25519; p=OAH+eQVEJoO1vwtnhyUBqWF628IBkf/8GTsF8ah5+/4= MS=ms59194513 drift-domain-verification=2d529019a29b7f2f58bd59a41a0abdde872c80cf584e20d1b58cfb628af61b8e mongodb-site-verification=Ps4fCFZFa6dUCH1KJMwrl3oumaCE0Jel onetrust-domain-verification=7b3d00b1e32140bb929f2a21735bae16 stripe-verification=a586899fe9532223a9a3a3405f7f99d9e1286b8cf116a9c412d644708f1a104e smartsheet-site-validation=LsLbY5NwoKd2avlrxMVVDPRxQ_1EXRtm apple-domain-verification=R8abEXzqodj1WhoR miro-verification=7e1b949aa782998962514b4867a2c78156c8e5bb atlassian-domain-verification=l+qyT57o2RRiPzd8OoFmKyYQwak0zooBv8cvGyY0cYJY4U1eWOVCY4RxSzoJlLws atlassian-domain-verification=Zwms6wYibNl10yHl8rJaGNFzJq96MUSWCIbyNg1WuDMgusi9fbuJanqeCKADWjBf stripe-verification=16883763b763e1f186f8b457a62e6e8c8e271097d3039e4c61311b5a1857251f google-site-verification=QD7mK1DSeZAG1v6_cSyKGWw07CA7Eo4SxKaeNP8eii0 google-site-verification=t_TqvyQaU_8mENXuC5DKXhWHDJfXkf2TYeCoU1gZFVc cloudbees-domain-verification=98a9b45129adb6e8036d956adda9e86db90e40c5 intacct-esk=4FED1A517BA8769BE0538C06A8C0589E browserstack-domain-verification=177928a5-5243-4000-8f1d-70f8cc190f89 d2a8o3jtx3i5xv.cloudfront.net v=spf1 include:spf.mandrillapp.com include:amazonses.com include:_spf.intacct.com include:mktomail.com ip4:74.125.0.0/16 ip4:209.85.128.0/17 ip6:2001:4860:4864::/56 ip6:2404:6800:4864::/56 ip6:2607:f8b0:4864::/56 ip6:2800:3f0:4864::/56 ip6:2a00:1450:4864::/56 ip6:2c0f:fb50:4864::/56 exists:%{i}._spf.mta.salesforce.com ip4:205.220.176.21 ip4:205.220.164.21 ip4:168.245.48.84 ip4:168.245.73.252 ip4:50.31.57.204 ip4:198.21.5.209 ip4:167.89.21.169 ip4:167.89.14.31 ip4:167.89.126.180 ip4:167.89.110.192 ip4:208.185.229.0/24 ip4:208.185.235.0/24 ip4:148.59.108.0/23 ip4:148.59.106.0/23 ip4:159.183.193.109 ip4:159.183.213.105 ip4:159.183.213.107 ip4:159.183.214.96 ip4:159.183.213.204 ip4:159.183.200.101 ip4:149.72.233.170 ip4:149.72.90.103 ip4:192.254.124.136 ip4:198.37.159.181 ip4:167.89.51.134 ip4:192.174.90.242 ip4:159.183.191.229 -all google-site-verification=ZcKBdDakQVqk80uRRuO9wsKLpBUcZ1ipNaaPliTQKjg google-site-verification=7wgY2mcAyS67VorHGL-rIMc4Gy7Hd1tOrRcfBgegdeg heroku-domain-verification=wy6s0kho27b7wwx0mqqypotojzwpxhvogdcrbl24uno mongodb-site-verification=u6v5K7NNHrlBXhkD6oA9d6cD5TeAldfK mongodb-site-verification=L4rNn1yNZmY392AVsc3S24hHtIqIyIU0

RegistrationMarkMonitor Inc.

registrar	MarkMonitor Inc.
registered	2012-10-18
expires	2027-10-18
last changed	2025-09-17
owner	REDACTED FOR PRIVACY
nameservers	kolton.ns.cloudflare.com monroe.ns.cloudflare.com
status	client delete prohibited client transfer prohibited client update prohibited server delete prohibited server transfer prohibited server update prohibited

registered 2012-10-18expires 2027-10-18

HTTPS certificate82 days left

valid	yes
issuer	Let's Encrypt
covers	.auth0.com, .edge.tenants.auth0.com, .guardian.auth0.com, .webtask.auth0.com, auth0.com
protocol	TLSv1.3

issued 2026-10-20expires 2027-01-18

DNSSECinsecure

Domain is not signed with DNSSEC

. → com → auth0.com

Email authenticationexcellent

SPF	pass v=spf1 include:spf.mandrillapp.com include:amazonses.com include:_spf.intacct.com include:mktomail.com ip4:74.125.0.0/16 ip4:209.85.128.0/17 ip6:2001:4860:4864::/56 ip6:2404:6800:4864::/56 ip6:2607:f8b0:4864::/56 ip6:2800:3f0:4864::/56 ip6:2a00:1450:4864::/56 ip6:2c0f:fb50:4864::/56 exists:%{i}._spf.mta.salesforce.com ip4:205.220.176.21 ip4:205.220.164.21 ip4:168.245.48.84 ip4:168.245.73.252 ip4:50.31.57.204 ip4:198.21.5.209 ip4:167.89.21.169 ip4:167.89.14.31 ip4:167.89.126.180 ip4:167.89.110.192 ip4:208.185.229.0/24 ip4:208.185.235.0/24 ip4:148.59.108.0/23 ip4:148.59.106.0/23 ip4:159.183.193.109 ip4:159.183.213.105 ip4:159.183.213.107 ip4:159.183.214.96 ip4:159.183.213.204 ip4:159.183.200.101 ip4:149.72.233.170 ip4:149.72.90.103 ip4:192.254.124.136 ip4:198.37.159.181 ip4:167.89.51.134 ip4:192.174.90.242 ip4:159.183.191.229 -all
DMARC	pass policy quarantine
DKIM	found: google, 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

30/45missing: CAA Records, DKIM Presence

Advanced Security

25/25

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 8 lookups

SURBL MultidomainURIBL MultidomainSpamCop104.18.37.18Barracuda104.18.37.18UCEPROTECT Level 1104.18.37.18SpamCop172.64.150.238Barracuda172.64.150.238UCEPROTECT Level 1172.64.150.238

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=auth0.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=auth0.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on auth0.com. Reference: /llms.txt.

Watch auth0.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