DNS report for dlv.isc.org

This report was generated 3d ago. Refresh?
A+
Connectivity
100%
Performance
94%
Resilience & Security
100%
DNS records
89%
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Connectivity: 100%

The following nameservers are available and responding correctly for DNS queries for your domain dlv.isc.org.

Nameserver IP address(es) SOA serial
dlv.ams.sns-pb.isc.org. 199.6.1.29
2001:500:60::29
2017093116
dlv.ord.sns-pb.isc.org. 199.6.0.29
2001:500:71::29
2017093116
dlv.sfba.sns-pb.isc.org. 149.20.64.4
2001:4f8:0:2::20
2017093116
ns.isc.afilias-nst.info. 199.254.63.254
2001:500:2c::254
2017093116
ns1.isc.ultradns.net. 156.154.100.23
2001:502:ad09::23
2017093116
ns2.isc.ultradns.net. 156.154.101.23
2001:502:2eda::23
2017093116

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: 94%

We tested each nameserver and measured the following response times.

Nameserver IP address(es) Response time
dlv.ams.sns-pb.isc.org. 199.6.1.29
2001:500:60::29
4ms
4ms
dlv.ord.sns-pb.isc.org. 199.6.0.29
2001:500:71::29
95ms
94ms
dlv.sfba.sns-pb.isc.org. 149.20.64.4
2001:4f8:0:2::20
143ms
147ms
ns.isc.afilias-nst.info. 199.254.63.254
2001:500:2c::254
4ms
234ms
ns1.isc.ultradns.net. 156.154.100.23
2001:502:ad09::23
13ms
10ms
ns2.isc.ultradns.net. 156.154.101.23
2001:502:2eda::23
11ms
16ms

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.

  • Nameserver ns.isc.afilias-nst.info. (2001:500:2c::254) replied, but took too long (234ms). This will severely impact performance.

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.

  • Nameserver dlv.ord.sns-pb.isc.org. (199.6.0.29) replied reasonably fast (< 150ms), but you should aim for < 50ms response times.
  • Nameserver dlv.sfba.sns-pb.isc.org. (149.20.64.4) replied reasonably fast (< 150ms), but you should aim for < 50ms response times.

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

  • Nameserver dlv.ams.sns-pb.isc.org. (199.6.1.29) replied quickly (< 50ms).
  • Nameserver dlv.ams.sns-pb.isc.org. (2001:500:60::29) replied in a reasonable time.
  • Nameserver dlv.ord.sns-pb.isc.org. (2001:500:71::29) replied in a reasonable time.
  • Nameserver dlv.sfba.sns-pb.isc.org. (2001:4f8:0:2::20) replied in a reasonable time.
  • Nameserver ns.isc.afilias-nst.info. (199.254.63.254) replied quickly (< 50ms).
  • Nameserver ns1.isc.ultradns.net. (156.154.100.23) replied quickly (< 50ms).
  • Nameserver ns1.isc.ultradns.net. (2001:502:ad09::23) replied in a reasonable time.
  • Nameserver ns2.isc.ultradns.net. (156.154.101.23) replied quickly (< 50ms).
  • Nameserver ns2.isc.ultradns.net. (2001:502:2eda::23) replied in a reasonable time.

Resilience & Security: 100%

These are the locations and providers of your nameservers.

Nameserver Location ISP
dlv.ams.sns-pb.isc.org. IPv4: US
IPv6: US
AS30132 - ISC-F-AS, US
AS30132 - ISC-F-AS, US
dlv.ord.sns-pb.isc.org. IPv4: US
IPv6: US
AS33071 - ISC-F-AS, US
AS33071 - ISC-F-AS, US
dlv.sfba.sns-pb.isc.org. IPv4: US
IPv6: US
AS1280 - ISC-AS-1280, US
AS1280 - ISC-AS-1280, US
ns.isc.afilias-nst.info. IPv4: US
IPv6: US
AS12041 - AS-AFILIAS1, US
AS12041 - AS-AFILIAS1, US
ns1.isc.ultradns.net. IPv4: US
IPv6: US
AS397215 397219 397220 397224 397231 397233 397238 -
AS397220 - ULTRADNS, US
ns2.isc.ultradns.net. IPv4: US
IPv6: US
AS397213 397215 397218 397220 397224 397231 397235 -
AS397220 - ULTRADNS, US

Good news, no warnings or errors were found.

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.
  • DNSSEC is enabled.
  • The nameservers are being operated from multiple domains (isc.org, afilias-nst.info, ultradns.net).

DNS records: 89%

Our scans detected the following publicly available DNS records.

Record TTL Value
A dlv.isc.org 5m 149.20.64.69
DNSKEY dlv.isc.org 1h ZSK | RSA/SHA-1 | BEAAAAOlYGw53D+f01yCL5JsP0SB6EjYrnd0JYRBooAaGPT+Q0kpiN+7 GviFh+nIazoB8e2Yv7mupgqkmIjObdcbGstYpUltdECdNpNmBvASKB9S BdtGeRvXXpORi3Qyxb9kHGG7SpzyYbc+KDVKnzYHB94pvqu3ZZpPFPBF tCibp/mkhw==

KSK | RSA/SHA-1 | BEAAAAPHMu/5onzrEE7z1egmhg/WPO0+juoZrW3euWEn4MxDCE1+lLy2 brhQv5rN32RKtMzX6Mj70jdzeND4XknW58dnJNPCxn8+jAGl2FZLK8t+ 1uq4W+nnA3qO2+DL+k6BD4mewMLbIYFwe0PG73Te9fZ2kJb56dhgMde5 ymX4BI/oQ+cAK50/xvJv00Frf8kw6ucMTwFlgPe+jnGxPPEmHAte/URk Y62ZfkLoBAADLHQ9IrS2tryAe7mbBZVcOwIeU/Rw/mRx/vwwMCTgNboM QKtUdvNXDrYJDSHZws3xiRXF1Rf+al9UmZfSav/4NWLKjHzpT59k/VSt TDN0YUuWrBNh
NS dlv.isc.org 5m dlv.ams.sns-pb.isc.org.
dlv.ord.sns-pb.isc.org.
dlv.sfba.sns-pb.isc.org.
ns.isc.afilias-nst.info.
ns1.isc.ultradns.net.
ns2.isc.ultradns.net.
SOA dlv.isc.org 1h ns-int.isc.org. hostmaster.isc.org. 2017093116 7200 3600 2419200 3600
TXT dlv.isc.org 5m "Empty Zone..."

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 NS records for "dlv.isc.org" 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 SPF records were found. SPF records limit which IPs are allowed to send mail from this domain. Even if this domain doesn't send e-mails, you should set up SPF to confirm it will never send e-mail, to prevent spoofing.
  • No DMARC records have been found. Consider configuring DMARC for improved e-mail authentication.
  • No IPv6 record has been found on the zone apex (dlv.isc.org). 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.

  • Your SOA serial number follows the best practice YYYYMMDDxx format.
  • Found a root (apex) DNS record.
  • The active nameservers match the NS records.
  • The DNS records appear to be RFC compliant.
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