How is 166.com?

Be careful risk 20/100

Registered 29 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

29 years

registered 1998-03-11

Blocklists

listings across 5 lists

Everything we looked at

DNS records2 record types

A	42.186.215.27
NS	ns2.166.com ns8.166.com ns1.166.com ns4.166.com ns6.166.com ns3.166.com ns5.166.com

RegistrationMarkMonitor Information Technology (Shanghai) Co., Ltd.

registrar	MarkMonitor Information Technology (Shanghai) Co., Ltd.
registered	1998-03-11
expires	2028-03-10
last changed	2026-06-24
owner	REDACTED FOR PRIVACY
nameservers	ns1.166.com ns2.166.com ns3.166.com ns4.166.com ns5.166.com ns6.166.com ns8.166.com
status	client delete prohibited client transfer prohibited client update prohibited server delete prohibited server transfer prohibited server update prohibited

registered 1998-03-11expires 2028-03-10

HTTPS certificatenot valid

valid	no
problem	Connection timed out

DNSSECinsecure

Domain is not signed with DNSSEC

. → com → 166.com

Email authenticationpoor

SPF	none
DMARC	none
DKIM	none of 1 common selectors

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

Security scoregrade D · 110/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

0/45missing: CAA Records, 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 · 5 lookups

SURBL MultidomainURIBL MultidomainSpamCop42.186.215.27Barracuda42.186.215.27UCEPROTECT Level 142.186.215.27

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=166.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=166.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on 166.com. Reference: /llms.txt.

IPv6. Does 166.com work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.

Watch 166.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