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Domainamazon.com
✓ 19 Pass ⚠ 4 Warn ℹ 10 Info
Action Items
Failures first, then warnings
Warn
DNSSEC
DS records
No DS records found at parent.
Warn
DNSSEC
DNSSEC chain
No DS records found at parent. Domain appears unsigned.
Warn
SOA Record
SOA MNAME
dns-external-route53.us-east-1.amazonaws.com is NOT listed among the authoritative NS records.
Warn
SOA Record
SOA Minimum TTL
Min TTL: 60 (1 min(s)). SOA Minimum TTL is 86400 (1 day). RFC 2308 redefines this as the Negative Cache TTL. A value of 3600 to 10800 (1-3 hours) is recommended to prevent prolonged outages for missing records.
PARENT
Info
Parent delegation records
Delegation NS records returned by parent zone com (a.gtld-servers.net):
ns-521.awsdns-01.netglue=[—] resolved=[205.251.194.9, 2600:9000:5302:900::1][TTL=172800] ns-264.awsdns-33.comglue=[205.251.193.8, 2600:9000:5301:800::1] resolved=[205.251.193.8, 2600:9000:5301:800::1][TTL=172800] ns-1707.awsdns-21.co.ukglue=[—] resolved=[205.251.198.171, 2600:9000:5306:ab00::1][TTL=172800] ns-1447.awsdns-52.orgglue=[—] resolved=[205.251.197.167, 2600:9000:5305:a700::1][TTL=172800]
PARENT
Pass
Nameservers listed at parent
Good. Parent server a.gtld-servers.net has the nameservers listed.
PARENT
Pass
Nameserver IPv4 address records
Good. Every nameserver has IPv4 A records. IPv6 AAAA records are informational only.
PARENT
Pass
DNS Parent sent Glue
Good. Parent response included glue address records.
NS
Info
NS records
NS records from the nameservers. Address health checks validate IPv4 A records only.
ns-1447.awsdns-52.org[205.251.197.167][TTL=21600] ns-1707.awsdns-21.co.uk[205.251.198.171][TTL=21600] ns-264.awsdns-33.com[205.251.193.8][TTL=21600] ns-521.awsdns-01.net[205.251.194.9][TTL=21600]
NS
Pass
Recursive queries
Good. The nameservers do not allow recursive queries for outside hosts.
ns-1447.awsdns-52.org 205.251.197.167 auth=ok recursion=closed tcp=ok serial=201 ns-1707.awsdns-21.co.uk 205.251.198.171 auth=ok recursion=closed tcp=ok serial=201 ns-264.awsdns-33.com 205.251.193.8 auth=ok recursion=closed tcp=ok serial=201 ns-521.awsdns-01.net 205.251.194.9 auth=ok recursion=closed tcp=ok serial=201
NS
Pass
Multiple nameservers
Good. It have 4 nameservers. RFC2182 recommends at least 3.
NS
Pass
Different subnets
Good. Nameservers are on 4 different subnets.
NS
Pass
Public IPs
Good. All nameserver IPv4 addresses are public.
NS
Pass
DNS servers responded
Good. All nameserver IPv4 addresses responded.
ns-1447.awsdns-52.org 205.251.197.167 auth=ok recursion=closed tcp=ok serial=201 ns-1707.awsdns-21.co.uk 205.251.198.171 auth=ok recursion=closed tcp=ok serial=201 ns-264.awsdns-33.com 205.251.193.8 auth=ok recursion=closed tcp=ok serial=201 ns-521.awsdns-01.net 205.251.194.9 auth=ok recursion=closed tcp=ok serial=201
NS
Pass
TCP connections
Good. All nameserver IPv4 addresses accept TCP connections on port 53.
ns-1447.awsdns-52.org 205.251.197.167 auth=ok recursion=closed tcp=ok serial=201 ns-1707.awsdns-21.co.uk 205.251.198.171 auth=ok recursion=closed tcp=ok serial=201 ns-264.awsdns-33.com 205.251.193.8 auth=ok recursion=closed tcp=ok serial=201 ns-521.awsdns-01.net 205.251.194.9 auth=ok recursion=closed tcp=ok serial=201
NS
Pass
Delegation mismatch
Good. NS records match between parent and authoritative servers.
NS
Pass
SOA serial consistency
Good. All nameservers agree on SOA serial: 201.
ns-1447.awsdns-52.org 205.251.197.167 auth=ok recursion=closed tcp=ok serial=201 ns-1707.awsdns-21.co.uk 205.251.198.171 auth=ok recursion=closed tcp=ok serial=201 ns-264.awsdns-33.com 205.251.193.8 auth=ok recursion=closed tcp=ok serial=201 ns-521.awsdns-01.net 205.251.194.9 auth=ok recursion=closed tcp=ok serial=201
SOA
Info
SOA record
SOA record details:
Primary NS : dns-external-route53.us-east-1.amazonaws.com Hostmaster : root@amazon.com Serial : 201 Refresh : 3600 Retry : 900 Expire : 604800 Min TTL : 60
SOA
Warn
SOA MNAME
dns-external-route53.us-east-1.amazonaws.com is NOT listed among the authoritative NS records.
SOA
Info
SOA Serial
Current SOA serial is 201. RFC 1912 recommends the YYYYMMDDnn date-based format(Year-Month-Day-Revision).
SOA
Pass
SOA Refresh
Refresh: 3600 (1 hour(s)). OK. Within recommended 1 to 24 hours range.
SOA
Pass
SOA Retry
Retry: 900 (15 min(s)). OK.
SOA
Pass
SOA Expire
Expire: 604800 (7 day(s)). OK.
SOA
Warn
SOA Minimum TTL
Min TTL: 60 (1 min(s)). SOA Minimum TTL is 86400 (1 day). RFC 2308 redefines this as the Negative Cache TTL. A value of 3600 to 10800 (1-3 hours) is recommended to prevent prolonged outages for missing records.
MX
Info
MX Records
Current MX records:
5 amazon-smtp.amazon.com [3.222.250.144]
MX
Info
MX count
Zone have 1 MX record(s). Consider a backup MX for redundancy.
MX
Pass
MX IPv4 addresses are public
Good. All MX records use public IPv4 addresses.
MX
Pass
MX is hostname
Good. All MX records use hostnames, not IP addresses.
MX
Pass
MX CNAME check
OK. No CNAME records found for MX hosts.
MX
Pass
Reverse PTR records
PTR (reverse DNS) records for MX hosts:
3.222.250.144 → smtp03.us-east-1.mail-perimeter.amazon.com
DNSSEC
Warn
DS records
No DS records found at parent.
DNSSEC
Info
DNSKEY records
No DNSKEY records found at child.
DNSSEC
Warn
DNSSEC chain
No DS records found at parent. Domain appears unsigned.
WWW
Info
WWW A Record
www.amazon.com resolves to:
13.249.70.232
WWW
Info
WWW AAAA (IPv6)
IPv6 addresses:
2600:1406:3a00:b80::3bd4 2600:1406:3a00:b88::3bd4
WWW
Pass
WWW IPv4 addresses are public
Good. All WWW IPv4 addresses are public.
WWW
Info
WWW CNAME
www.amazon.com has a CNAME pointing to tp.47cf2c8c9-frontier.amazon.com.
Processed in 0.167s · Real DNS resolution via dnspython · Wed, 23 Sep 2026 20:35:08 GMT