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Total

DNS

Email

Security

Network

100

Availability

Domaina16z.com

IPv41

IPv60

MX records5

StatusActive

Domain technical report

Andreessen Horowitz | Software Is Eating the World

a16z.com

Andreessen Horowitz (a16z) is a venture capital firm in Silicon Valley, California, investing in bold founders, innovators, and entrepreneurs building the future through technology.

Generated: 2026-08-09T05:23:33-05:00 · Cached result

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IPv41

IPv60

MX5

NS4

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

4 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

5 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

86 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers16 / 35 pts · Security

4 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: acd89244c803f7181.awsglobalaccelerator.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/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

75.2.60.5

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

10 aspmx.l.google.com.
50 aspmx3.googlemail.com.
20 alt1.aspmx.l.google.com.
30 alt2.aspmx.l.google.com.
40 aspmx2.googlemail.com.

TXT

39 record(s)

"MS=297F6982EA6FC1794C4BC3FB5FF63A8E4CD4FAC4"
"202608050914220lqeqr1be7wzgwu0su3we15k384s7n93csbokzwx2sxgd1zc93"
"mixpanel-domain-verify=b42dbd80-4f32-4eb4-ad76-2e0c938506f7"
"202608090905190a7llg4n8rkzcutp59iji07fm701h5o4qt5kjtnnfrbe7zuw4l"
"openai-domain-verification=dv-CeeBac0VpbCCPpKaEHijwN7V"
"zapier-domain-verification-challenge=f9cf9944-aaa7-4e2b-aabf-d2a392c18e0c"
"MS=ms78121488"
"google-site-verification=Cda284zEu8xh5veDdCm00SdfO_tJF-ebT809nkgB1zA"
"jamf-site-verification=r5S6YMFCZk83AroC1PcG8w"
"stripe-verification=FC0027ACED84DA245559E90AA0BE435C9D507EE24C5CF17AFD11316B98087577"
"cursor-domain-verification-7pnt8f=k0kHfixkiuNQWkL4COkqeKER8"
"anthropic-domain-verification-afe4hb=TrYvFm4pI5i7OwaiQnLdjFmZi"
"gamma-domain-verification-gp4vsa=J4Meie8RekYZa4fxKQ5kuayqy"
"a5ml0q2qredqkscjd0cnd3rs5o"
"serval-domain-verification-nadw7s=JIQXhfD5M5kFQCtvXTVU0q9Zu"
"ZOOM_verify_CZpP8WiXT3CuvCsqJO99fQ"
"wiz-domain-verification=5dc014a9a7637634bf88686260016ef95998390f9f1703e28716979f451f9a73"
"google-site-verification=-Wz2OSxeSq3x0u54jUMjQwWMa1vmMLS52gm593Cs9d0"
"202608060905301j6t1jmdfyg3x8dd9r0r73vircyqz4rt3p474l7b0v0l7m26wi"
"hubspot-domain-verification=MWVlYzc1MzAtMzY4MC00MzNkLTk0NGQtOWU2Y2I3MTJiZDI2"
"ccisso=ccd758c0-2760-47f8-a10d-e5fc116fddae"
"mgverify=0fe09ec683f6868bb8547d3edcd914093dd94e3957094a60fe4f5e496b2b9745"
"convex-domain-verification-256d1w=dIDjkgljtpVRgsyaRVC1ofc7L"
"elevenlabs=27i8sF6BnzYwPsZ5yq5TdjVJ000nf-OvqH4jBvfEnAQ"
"censys-domain-verification=J1TG-Io7I9BckAxCWrurh86BYAQZGVEmTynNV9awatzH"
"v=spf1 include:_spf.google.com include:_spf.salesforce.com include:spf.happyfox." "com include:mktomail.com include:sendgrid.net ip4:205.201.128.0/20 ip4:198.2.128" ".0/18 ip4:199.15.214.45/32 ip4:199.15.214.46/32 ip4:199.15.214.47/32 ip4:199.15." "214.48/32 ip4:199.15.214.49/32 ip4:199.15.214.50/32 ip4:199.15.214.199/32 ip4:19" "9.15.214.201/32 ip4:199.15.214.202/32 ip4:199.15.215.77/32 ip4:199.15.215.78/32 " "ip4:199.15.215.79/32 ip4:199.15.215.80/32 ip4:199.15.215.81/32 ip4:199.15.215.82" "/32 ip4:192.254.121.248/32 ip4:148.105.12.0/24 ip4:167.89.98.146/32 ip4:167.89.8" "9.46/32 ip4:54.149.36.89/32 ip4:44.236.219.44/32 -all"
"h1-domain-verification=vkosaeLv5aMSu6gt7GRxtajukLQ3hKGixbfbe9ZWR8VwKYf9"
"1password-site-verification=YNM3U5T3JZG5PEII74IIUKCOLQ"
"2026080809053761c3zbz8zxj7ohpnxqzvxcjpbh98de6lpd14xzr7mg64iaoo37"
"domain-verification=1bfe2ca1d5037d223770e532e8422f430ab27da4347b03cf1c29122512653205"
"notion_verify_FvVFn84Y5fBnAntNFUjAg1p8Mox5n8sVJtGGVpmMeKV3PNqhbTdF1MsP5gWvM08GZqFDAZ"
"atlassian-domain-verification=afgyuWvgwYP6dShfPqgKfpNFXkbap4546WDp6lt8DCGR1IykT5K03ZapUqnP0rp5"
"linear-domain-verification=ka59g9ke4vnh"
"202608070905583qutwxqxvjnv3x7eib38wzp1k3jyy9suj4y289ac87rcrci4ar"
"affinity-allowed-subdomains=a16z,a16z-crypto"
"TAILSCALE-hgqvPubwp5HFczvxm0V3"
"parsec-domain-verification=td_3ArojZEiT7u4XxzU4tNRo3dw1iF"
"neat-pulse-domain-verification-4wMj96X=d2d2ebff-e37e-4bac-9efc-a5b0e583a0d4"
"perplexity-ai-domain-verification-66m0r7=3MZMPYJPZOdMXMDKTQAozQpXs"

NS

4 record(s)

ha4.markmonitor.zone.
ha1.markmonitor.zone.
ha2.markmonitor.zone.
ha3.markmonitor.zone.

SOA

1 record(s)

ha1.markmonitor.zone. hostmaster.markmonitor.com. 2026080901 86400 3600 2592000 172800

CAA

5 record(s)

0 issue "pki.goog"
0 issue "digicert.com"
0 issue "godaddy.com"
0 issue "letsencrypt.org"
0 issue "amazon.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 include:_spf.google.com include:_spf.salesforce.com include:spf.happyfox.com include:mktomail.com include:sendgrid.net ip4:205.201.128.0/20 ip4:198.2.128.0/18 ip4:199.15.214.45/32 ip4:199.15.214.46/32 ip4:199.15.214.47/32 ip4:199.15.214.48/32 ip4:199.15.214.49/32 ip4:199.15.214.50/32 ip4:199.15.214.199/32 ip4:199.15.214.201/32 ip4:199.15.214.202/32 ip4:199.15.215.77/32 ip4:199.15.215.78/32 ip4:199.15.215.79/32 ip4:199.15.215.80/32 ip4:199.15.215.81/32 ip4:199.15.215.82/32 ip4:192.254.121.248/32 ip4:148.105.12.0/24 ip4:167.89.98.146/32 ip4:167.89.89.46/32 ip4:54.149.36.89/32 ip4:44.236.219.44/32 -all

DMARC

Configured

v=DMARC1; p=quarantine; pct=100; sp=reject; rua=mailto:21zezn4c@ag.dmarcian.com; ruf=mailto:21zezn4c@fr.dmarcian.com

DKIM

Selector google

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCAGPdZu7vp17r7RxYt4J/vKQiOIReSWrnKS9XPkeVjEg0ZRJ8vvm9tsFM2WbMY1/DHkeKVpEUVAv2VrHKT38h62TgeplAmNoLqvT4X2BQGLLjrSN187cHqoPpshriP1lLBTc4/m3ZKZqhNuF/CR6Fquy9ugKgO4OkNpylohJtgdwIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Andreessen Horowitz | Software Is Eating the World

Description

Andreessen Horowitz (a16z) is a venture capital firm in Silicon Valley, California, investing in bold founders, innovators, and entrepreneurs building the future through technology.

Final URL

https://a16z.com/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://a16z.com/

Version

Server

Netlify

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Let's Encrypt

a16z.com

Valid from

2026-08-05T21:13:54-05:00

Valid until

2026-11-03T20:13:53-06:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

4 active

✓

HSTSImplemented

✓

Content Security PolicyImplemented

✓

X-Content-Type-OptionsImplemented

✓

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

75.2.60.5

43,93 ms

Cloudflare

1.1.1.1

75.2.60.5

67,92 ms

Quad9

9.9.9.9

75.2.60.5

70,90 ms

OpenDNS

208.67.222.222

75.2.60.5

52,10 ms

AdGuard

94.140.14.14

75.2.60.5

171,85 ms

IP, geolocation and ASNAssociated network information

75.2.60.5

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

aspmx.l.google.com

Port 25: Closed/unreachable - 22.3 ms - 220 mx.google.com ESMTP 006d021491bc7-6b04d182f06si2552522eaf.60 - gsmtp
Port 465: Closed/unreachable - 4008 ms - 
Port 587: Closed/unreachable - 4002.9 ms -

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