DNS report for stackoverflow.com

This report was generated 2 weeks ago. Refresh?
A+
Connectivity
100%
Performance
100%
Resilience & Security
80%
DNS records
94%
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Connectivity: 100%

The following nameservers are available and responding correctly for DNS queries for your domain stackoverflow.com.

Nameserver IP address(es) SOA serial
ns-1033.awsdns-01.org. 205.251.196.9
2600:9000:5304:900::1
1
ns-358.awsdns-44.com. 205.251.193.102
2600:9000:5301:6600::1
1
ns-cloud-e1.googledomains.com. 216.239.32.110
2001:4860:4802:32::6e
1
ns-cloud-e2.googledomains.com. 216.239.34.110
2001:4860:4802:34::6e
1

Good news, no warnings or errors were found.

We could not find any recommendations at this time.

Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.

  • All nameservers reply with the same SOA serial number.
  • The nameserver IPs are distributed across multiple subnets.
  • All nameservers are online.
  • Nameservers are available over IPv4.
  • Nameservers are available over IPv6.

Performance: 100%

We tested each nameserver and measured the following response times.

Nameserver IP address(es) Response time
ns-1033.awsdns-01.org. 205.251.196.9
2600:9000:5304:900::1
13ms
83ms
ns-358.awsdns-44.com. 205.251.193.102
2600:9000:5301:6600::1
7ms
5ms
ns-cloud-e1.googledomains.com. 216.239.32.110
2001:4860:4802:32::6e
10ms
9ms
ns-cloud-e2.googledomains.com. 216.239.34.110
2001:4860:4802:34::6e
11ms
9ms

Good news, no warnings or errors were found.

We could not find any recommendations at this time.

Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.

  • Nameserver ns-1033.awsdns-01.org. (205.251.196.9) replied quickly (< 50ms).
  • Nameserver ns-1033.awsdns-01.org. (2600:9000:5304:900::1) replied in a reasonable time.
  • Nameserver ns-358.awsdns-44.com. (205.251.193.102) replied quickly (< 50ms).
  • Nameserver ns-358.awsdns-44.com. (2600:9000:5301:6600::1) replied in a reasonable time.
  • Nameserver ns-cloud-e1.googledomains.com. (216.239.32.110) replied quickly (< 50ms).
  • Nameserver ns-cloud-e1.googledomains.com. (2001:4860:4802:32::6e) replied in a reasonable time.
  • Nameserver ns-cloud-e2.googledomains.com. (216.239.34.110) replied quickly (< 50ms).
  • Nameserver ns-cloud-e2.googledomains.com. (2001:4860:4802:34::6e) replied in a reasonable time.

Resilience & Security: 80%

These are the locations and providers of your nameservers.

Nameserver Location ISP
ns-1033.awsdns-01.org. IPv4: US
IPv6: US
AS16509 - AMAZON-02 - Amazon.com, Inc., US
AS16509 - AMAZON-02 - Amazon.com, Inc., US
ns-358.awsdns-44.com. IPv4: US
IPv6: US
AS16509 - AMAZON-02 - Amazon.com, Inc., US
AS16509 - AMAZON-02 - Amazon.com, Inc., US
ns-cloud-e1.googledomains.com. IPv4: US
IPv6: US
AS15169 - GOOGLE - Google LLC, US
AS15169 - GOOGLE - Google LLC, US
ns-cloud-e2.googledomains.com. IPv4: US
IPv6: US
AS15169 - GOOGLE - Google LLC, US
AS15169 - GOOGLE - Google LLC, US

We detected the following errors or warnings about your DNS configuration. These caused your DNS rating to be lowered. Resolving these will grant a higher DNS Spy rating for your domain.

  • No DNSSEC records found. Consider enabling DNSSEC, as it provides a way to validate DNS responses for data integrity.

We detected some possible recommendations for you to consider. No penalties were given for these, but resolving them can give you a higher DNS score.

  • All IPv4 nameservers appear to be hosted in the same country (US). You might want to consider spreading the nameservers geographically.
  • All IPv6 nameservers appear to be hosted in the same country (US). You might want to consider spreading the nameservers geographically.
  • No CAA records found. Consider adding CAA records, as it adds increased security by limiting which Certificate Authorities can issue certificates for this domain. (more info)

Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.

  • You have more than 1 nameserver.
  • The IPv4 nameservers are distributed among multiple providers.
  • The IPv6 nameservers are distributed among multiple providers.
  • The nameservers are being operated from multiple domains (awsdns-01.org, awsdns-44.com, googledomains.com).

DNS records: 94%

Our scans detected the following publicly available DNS records.

Record TTL Value
A stackoverflow.com 5m 151.101.1.69
151.101.129.69
151.101.193.69
151.101.65.69
MX stackoverflow.com 5m 1 aspmx.l.google.com.
10 alt3.aspmx.l.google.com.
10 alt4.aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
NS stackoverflow.com 172800s ns-1033.awsdns-01.org.
ns-358.awsdns-44.com.
ns-cloud-e1.googledomains.com.
ns-cloud-e2.googledomains.com.
SOA stackoverflow.com 900s ns-1033.awsdns-01.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
TXT stackoverflow.com 5m "MS=ms52592611"
"google-site-verification=ctogLnZNAdc_CXq8yOhODMLpmugGynjxKecKHDz4oL8"
"google-site-verification=o3EMam8yBGo1yEjyybIiZcOunGHOQKpo8JmOtp9n1BU"
"google-site-verification=rdWtMbplKjbRHGr2dNONfwkqithlUvjr3u6i8QEz_mo"
"v=spf1 ip4:198.252.206.0/24 ip4:192.111.0.0/24 ip4:52.38.191.241 ip4:35.190.247.0/24 ip4:64.233.160.0/19 ip4:66.102.0.0/20 ip4:66.249.80.0/20 ip4:72.14.192.0/18 ip4:74.125.0.0/16 ip4:108.177.8.0/21 ip4:173.194.0.0/16 include:_spf1.stackoverflow.com ~all"
TXT _dmarc.stackoverflow.com 5m "v=DMARC1\;p=reject\;sp=reject\;pct=100\;rua=mailto:dmarc-aggregates@stackoverflow.com\;ruf=mailto:dmarc-forensics@stackoverflow.com\;fo=1"
A ads.stackoverflow.com 5m 198.252.206.16
A blog.stackoverflow.com 5m 151.101.1.69
151.101.129.69
151.101.193.69
151.101.65.69
CNAME calendar.stackoverflow.com 5m ghs.googlehosted.com.
CNAME chat.stackoverflow.com 5m chat.stackexchange.com.
TXT cm._domainkey.stackoverflow.com 5m "k=rsa\; t=y\; p=MHswDQYJKoZIhvcNAQEBBQADagAwZwJgwdr6jM0nW99dlGheQgWrC90grRa5q+ZPkmvrGN1cwie+Gt5w1orjmMRVuLBbStQ3c/slSPWm9otewskbIhd7qMVRmzvzJgxfmB6wpieptrZnvgbe9doWidVaeMIAw58LAgMBAAE="
A dev.stackoverflow.com 5m 151.101.1.70
151.101.129.70
151.101.193.70
151.101.65.70
TXT dk._domainkey.stackoverflow.com 5m "k=rsa\; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3Gnks18obM9XO0ttwJZzF4KZ5ItqV+1mj6G6YMYHs+t37vx9anqDYLCIBaBlwdmNN3c0EeBKLSsOYvdfC7veNTAbNO8cZbphsnbKt/omVJNUZuzHqMt1QdssB0Eo8COGcJPTE7psVE1fIz3lCFvaxeXGgaQCq0KoMe6dfEKYfXwIDAQAB"
CNAME mail.stackoverflow.com 5m ghs.googlehosted.com.
CNAME www.stackoverflow.com 1h stackoverflow.com.

We detected the following errors or warnings about your DNS configuration. These caused your DNS rating to be lowered. Resolving these will grant a higher DNS Spy rating for your domain.

  • Consider giving the MX record for "stackoverflow.com" a longer TTL, as those don't change often (1h+).

We detected some possible recommendations for you to consider. No penalties were given for these, but resolving them can give you a higher DNS score.

  • No IPv6 record has been found on the zone apex (stackoverflow.com). Consider enabling IPv6 in the infrastructure by adding an AAAA record on this domain.

Good news, we detected the following achievements in your DNS configuration. Each of these checks has increased your DNS Spy score.

  • The root DNS records points to multiple IPs using Round Robin.
  • Multiple MX records found.
  • MX records with different priorities found (main + fall-back mailservers).
  • The MX records points to multiple mailservers.
  • The NS records have a long TTL (1h+).
  • SPF records have been found.
  • SPF records are set up restrictively.
  • DMARC records have been found.
  • DMARC records are set up restrictively.
  • Found a root (apex) DNS record.
  • Found a www DNS record.
  • The active nameservers match the NS records.
  • The DNS records appear to be RFC compliant.
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