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Domain footprint: nlnetlabs.nl
Resolved live just now — where this domain's services actually run, with each address attributed by OrgIndex. A DNS observation, not registry data: many organisations run entirely on providers' networks and hold no IP space of their own.
Mail:
mxext1.mailbox.org → Heinlein Support GmbH ·
mxext2.mailbox.org → Heinlein Support GmbH ·
mxext3.mailbox.org → Heinlein Support GmbH ·
mxext4.mailbox.org → Heinlein Support GmbH
SPF sends via:
_spf.google.com · mailbox.org
Separately, 3 organisations whose name resembles “nlnetlabs.nl” — these may be unrelated to the domain above.