Hostname

d3a.cz

Last fetched Tue, 30 Jun 2026 04:57:00 GMT

d3a.cz resolves to 1 IPv4 address operated by AS35236 in CZ. WHOIS lists registrar:reg-internet-cz as the registrar.

Nutrition Label

Resolution chain

d3a.cz resolves to 1 distinct IPv4 address via WhisperGraph DNS data. Each row links to the IP, prefix, and announcing ASN.

IP	Prefix	ASN	Operator	Country
45.91.28.133	45.91.28.0/22	AS35236	—	CZ

WHOIS identity

Registrar: registrar:reg-internet-cz
Organization: d3a, spol. s r.o.
Contact emails: —

Subdomains

6 observed subdomains of d3a.cz.

Subdomain
autoconfig.d3a.cz
imap.d3a.cz
mail.d3a.cz
nas.d3a.cz
smtp.d3a.cz
www.d3a.cz

Web-graph footprint

Distinct hostnames that link to or from d3a.cz in the public web crawl.

21 sites link to this hostname.

27 sites linked to from this hostname.

Sample inbound links

Sample outbound links

Threat posture

History

Mail and authentication

MX records

mail.d3a.cz

SPF policy

1 SPF mechanism authorising senders for d3a.cz.

Mechanism	Target
SPF_MX	d3a.cz

Pivot deeper into the graph from d3a.cz.

Cypher and MCP

Reproduce the resolution chain directly against graph.whisper.security:

MATCH (h:HOSTNAME {name: "d3a.cz"})-[:RESOLVES_TO]->(ip:IPV4)
      -[:ANNOUNCED_BY]->(ap:ANNOUNCED_PREFIX)
      -[:ROUTES]->(asn:ASN)-[:HAS_NAME]->(n:ASN_NAME)
RETURN ip.name AS ip, ap.name AS prefix, asn.name AS asn, n.name AS operator
LIMIT 20

Or query Whisper from your own LLM workflow via the Whisper MCP server.