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Total

DNS

Email

Security

Network

100

Availability

Domaingrc.com

IPv41

IPv60

MX records1

StatusActive

Domain technical report

Home of Gibson Research Corporation

grc.com

Steve Gibson's and Gibson Research Corporation's Web homepage.

Generated: 2026-08-09T10:33:19-05:00 · Cached result

JSON CSV PDF Visit site

IPv41

IPv60

MX1

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

1 IPv4 address(es) detected.

IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

2 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

✓

CAA policy5 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

1 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

✓

DKIM20 / 20 pts · Mail

A DKIM selector was verified.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

14 day(s) remaining.

Certificate lifetime2 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: grc.com

IPv4 diversity20 / 35 pts · Network

Two or more IPv4 addresses receive full points.

IPv6 connectivity0 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓

HTTP response40 / 40 pts · Availability

HTTP/1.1 200 OK

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

4.79.142.200

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

1 record(s)

10 grc.com.

TXT

5 record(s)

"v=spf1 ip4:4.79.142.192/28 a:client.grc.com a:grc.com -all"
"_e9izydias4fdktb7grdz8lx129rf0kz"
"google-site-verification=lTHvpojcfPIYXGkOqbku5TcOkpo52Exo-qWuQJi5bpw"
"_bpovimyxhv2xbvowiwnvlkhz27b4z4f"
"7pdq8vl28psslbzzx8g9s3pbwjvksk24"

NS

2 record(s)

ns3.level3.net.
ns4.level3.net.

SOA

1 record(s)

grc.com. dns2005.grc.com. 2026072408 14400 300 5184000 14400

CAA

1 record(s)

0 issue "digicert.com"

DS

0 record(s)

—

Not configured

DNSKEY

0 record(s)

—

Not configured

RRSIG

0 record(s)

—

Not configured

NSEC

0 record(s)

—

Not configured

NSEC3

0 record(s)

—

Not configured

SRV

0 record(s)

—

Not configured

NAPTR

0 record(s)

—

Not configured

TLSA

0 record(s)

—

Not configured

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 ip4:4.79.142.192/28 a:client.grc.com a:grc.com -all

DMARC

Configured

v=DMARC1; p=reject; sp=reject; rua=mailto:re+2d18e30bd27e@inbound.dmarcdigests.com; adkim=s; aspf=s; fo=1; pct=100

DKIM

Selector dkim

v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApWmZrfy5xHlos6DDOeMDmEIDdysdag/1RTMc0jWKrhJH2kucIjxp4RcxaPh0ZqpIA/VqTSFVjgEddkpHqjh2nerwDtlwVPjwkccXYJVo61FpVqErCFFgLfhEqWoXW26x4D2x00RdQ2B3308la0BjWnV3y59OCmumon2B6LWHLW3hX4UUc1uz261I/2/x1jpHvO2zuckDq5uTcIOUqS1+RZeCospr9xodV9fTyQ33ol4oCyNJF0GyAvWQFJnfD81GCxgkYO4ATuDtndBdoYoCN6pjRceT5pLPKMe99KisoEa2191R/sxNFd76cfWAMwPewxnjGG05YBuosfx9wsjZcQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Home of Gibson Research Corporation

Description

Steve Gibson's and Gibson Research Corporation's Web homepage.

Final URL

https://www.grc.com/intro.htm

HTTP status

200

HTTP

Status

HTTP/1.1 200 OK

Final URL

https://www.grc.com/intro.htm

Version

Server

GRC/IIS Hybrid Application Webserver

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

DigiCert Inc

grc.com

Valid from

2025-07-22T19:00:00-05:00

Valid until

2026-08-23T18:59:59-05:00

Days remaining

Protocol

TLSv1.2

Cipher

ECDHE-RSA-AES256-SHA384

Security headers

2 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

✓

X-Frame-OptionsImplemented

—

Referrer PolicyNot detected

—

Permissions PolicyNot detected

—

Cross-Origin-Opener-PolicyNot detected

—

Cross-Origin-Embedder-PolicyNot detected

—

Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

4.79.142.200

46,80 ms

Cloudflare

1.1.1.1

4.79.142.200

49,80 ms

Quad9

9.9.9.9

4.79.142.200

103,50 ms

OpenDNS

208.67.222.222

4.79.142.200

50,35 ms

AdGuard

94.140.14.14

4.79.142.200

103,35 ms

IP, geolocation and ASNAssociated network information

4.79.142.200

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

grc.com

Port 25: Closed/unreachable - 0.6 ms - 
Port 465: Closed/unreachable - 60.8 ms - 
Port 587: Closed/unreachable - 58.7 ms -

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