As defined by RFC 1035, the SOA responsible-party field represents an operational contact email address, intended for DNS-related operational matters; whether this mailbox exists, is monitored, and can be used for effective operational communication depends on the domain operator.
As recommended by RFC 1912, reverse DNS should identify the responsible infrastructure, providing operational context for an IP address and supporting effective communication with the responsible operator, while remaining a common operational requirement for email services.

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Web Hosting Lookup	Enter a domain — results cached for 180 seconds; DNS TTL ignored.	Operational from May 6, 2025 - Security Header Tool - Insight at janwillemstegink.nl
IPv4 without www	IPv6 without www	IPv4 with www	IPv6 with www
Start of Authority +/-	Start of Authority +/-	Start of Authority +/-	Start of Authority +/-
Nameservers +/-	Nameservers +/-	Nameservers +/-	Nameservers +/-
Autonomous System +/-	Autonomous System +/-	Autonomous System +/-	Autonomous System +/-
[ANAME] +/-	[ANAME] +/-	[ANAME] +/-	[ANAME] +/-
CNAME +/-	CNAME +/-	CNAME +/-	CNAME +/-
A +/-	A +/-	A +/-	A +/-
AAAA +/-	AAAA +/-	AAAA +/-	AAAA +/-
rDNS +/-	rDNS +/-	rDNS +/-	rDNS +/-
FCrDNS +/-	FCrDNS +/-	FCrDNS +/-	FCrDNS +/-
HINFO +/-	HINFO +/-	HINFO +/-	HINFO +/-
CAA higher +/-	CAA higher +/-	CAA higher +/-	CAA higher +/-
CAA +/-	CAA +/-	CAA +/-	CAA +/-
MX +/-	MX +/-	MX +/-	MX +/-
MX lookup +/-	MX lookup +/-	MX lookup +/-	MX lookup +/-
DMARC CNAME higher +/-	DMARC CNAME higher +/-	DMARC CNAME higher +/-	DMARC CNAME higher +/-
DMARC TXT higher +/-	DMARC TXT higher +/-	DMARC TXT higher +/-	DMARC TXT higher +/-
DMARC CNAME +/-	DMARC CNAME +/-	DMARC CNAME +/-	DMARC CNAME +/-
DMARC TXT +/-	DMARC TXT +/-	DMARC TXT +/-	DMARC TXT +/-
SPF TXT +/-	SPF TXT +/-	SPF TXT +/-	SPF TXT +/-
TXT +/-	TXT +/-	TXT +/-	TXT +/-
TLSA _25._tcp +/-	TLSA _25._tcp +/-	TLSA _25._tcp +/-	TLSA _25._tcp +/-
TLSA _25._udp +/-	TLSA _25._udp +/-	TLSA _25._udp +/-	TLSA _25._udp +/-
TLSA _25._sctp +/-	TLSA _25._sctp +/-	TLSA _25._sctp +/-	TLSA _25._sctp +/-
TLSA _25._quic +/-	TLSA _25._quic +/-	TLSA _25._quic +/-	TLSA _25._quic +/-
TLSA _443._tcp +/-	TLSA _443._tcp +/-	TLSA _443._tcp +/-	TLSA _443._tcp +/-
SSL raw +/-	SSL raw +/-	SSL raw +/-	SSL raw +/-
SSL +/-	SSL +/-	SSL +/-	SSL +/-
robots.txt url +/-	robots.txt url +/-	robots.txt url +/-	robots.txt url +/-
robots.txt +/-	robots.txt +/-	robots.txt +/-	robots.txt +/-
meta tags +/-	meta tags +/-	meta tags +/-	meta tags +/-
legacy security.txt +/-	legacy security.txt +/-	legacy security.txt +/-	legacy security.txt +/-
.well-known/security.txt +/-	.well-known/security.txt +/-	.well-known/security.txt +/-	.well-known/security.txt +/-
HSTS header +/-	HSTS header +/-	HSTS header +/-	HSTS header +/-
HTTP headers +/-	HTTP headers +/-	HTTP headers +/-	HTTP headers +/-
transfer information +/-	transfer information +/-	transfer information +/-	transfer information +/-