Hostname

bst21.de

Last fetched Fri, 17 Jul 2026 08:24:55 GMT

bst21.de appears in WhisperGraph with partial WHOIS records but no current public IPv4 resolution.

Nutrition Label

Resolution chain

bst21.de has no current public IPv4 resolution in WhisperGraph. The WHOIS record below is the only graph data we have on this hostname.

WHOIS identity

No WHOIS records are currently associated with bst21.de in WhisperGraph.

Subdomains

7 observed subdomains of bst21.de.

Subdomain
cloud.bst21.de
lime.bst21.de
lyncdiscover.bst21.de
rds1.bst21.de
remote.bst21.de
www.bst21.de
zimbra.bst21.de

Web-graph footprint

Distinct hostnames that link to or from bst21.de in the public web crawl.

5 sites link to this hostname.

11 sites linked to from this hostname.

Sample inbound links

Sample outbound links

Threat posture

History

Mail and authentication

MX records

bst21-de.mail.protection.outlook.com

SPF policy

1 SPF mechanism authorising senders for bst21.de.

Mechanism	Target
SPF_INCLUDE	spf.protection.outlook.com

Pivot deeper into the graph from bst21.de.

Cypher and MCP

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

MATCH (h:HOSTNAME {name: "bst21.de"})-[: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.