Domainfastly.com
✓ 20 Pass
⚠ 4 Warn
ℹ 9 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
NS Records
SOA serial consistency
SOA serial mismatch across IPv4 nameservers. This usually indicates that secondary nameservers are out of sync with the primary, causing inconsistent DNS responses.
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.
Category
Status
Test name
Information
PARENT
Info
Parent delegation records
Delegation NS records returned by parent zone com (a.gtld-servers.net):
edns1.ultradns.comglue=[2001:502:f3ff::201, 204.74.66.1] resolved=[204.74.66.1, 2001:502:f3ff::201][TTL=172800]
edns1.ultradns.netglue=[—] resolved=[204.74.110.1, 2610:a1:1014::201][TTL=172800]
ns-cloud-a1.googledomains.comglue=[2001:4860:4802:32::6a, 216.239.32.106] resolved=[216.239.32.106, 2001:4860:4802:32::6a][TTL=172800]
ns-cloud-a2.googledomains.comglue=[2001:4860:4802:34::6a, 216.239.34.106] resolved=[216.239.34.106, 2001:4860:4802:34::6a][TTL=172800]
oak.fastlydns.comglue=[157.52.78.5, 2a04:4e47:4::5] resolved=[157.52.78.5, 2a04:4e47:4::5][TTL=172800]
oak.fastlydns.netglue=[—] resolved=[167.82.228.5, 2a04:4e47:6::5][TTL=172800]
oak.fastlydns.orgglue=[—] resolved=[167.82.229.5, 2a04:4e47:7::5][TTL=172800]
oak.fastlydns.devglue=[—] resolved=[157.52.79.5, 2a04:4e47:5::5][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.
Category
Status
Test name
Information
NS
Info
NS records
NS records from the nameservers. Address health checks validate IPv4 A records only.
edns1.ultradns.com[204.74.66.1][TTL=21600]
edns1.ultradns.net[204.74.110.1][TTL=21600]
ns-cloud-a1.googledomains.com[216.239.32.106][TTL=21600]
ns-cloud-a2.googledomains.com[216.239.34.106][TTL=21600]
oak.fastlydns.com[157.52.78.5][TTL=21600]
oak.fastlydns.dev[157.52.79.5][TTL=21600]
oak.fastlydns.net[167.82.228.5][TTL=21600]
oak.fastlydns.org[167.82.229.5][TTL=21600]
NS
Pass
Recursive queries
Good. The nameservers do not allow recursive queries for outside hosts.
edns1.ultradns.com 204.74.66.1 auth=ok recursion=closed tcp=ok serial=2023023207
edns1.ultradns.net 204.74.110.1 auth=ok recursion=closed tcp=ok serial=2023023207
ns-cloud-a1.googledomains.com 216.239.32.106 auth=ok recursion=closed tcp=ok serial=1
ns-cloud-a2.googledomains.com 216.239.34.106 auth=ok recursion=closed tcp=ok serial=1
oak.fastlydns.com 157.52.78.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.dev 157.52.79.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.net 167.82.228.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.org 167.82.229.5 auth=ok recursion=closed tcp=ok serial=2023023207
NS
Pass
Multiple nameservers
Good. It have 8 nameservers. RFC2182 recommends at least 3.
NS
Pass
Different subnets
Good. Nameservers are on 8 different subnets.
NS
Pass
Public IPs
Good. All nameserver IPv4 addresses are public.
NS
Pass
DNS servers responded
Good. All nameserver IPv4 addresses responded.
edns1.ultradns.com 204.74.66.1 auth=ok recursion=closed tcp=ok serial=2023023207
edns1.ultradns.net 204.74.110.1 auth=ok recursion=closed tcp=ok serial=2023023207
ns-cloud-a1.googledomains.com 216.239.32.106 auth=ok recursion=closed tcp=ok serial=1
ns-cloud-a2.googledomains.com 216.239.34.106 auth=ok recursion=closed tcp=ok serial=1
oak.fastlydns.com 157.52.78.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.dev 157.52.79.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.net 167.82.228.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.org 167.82.229.5 auth=ok recursion=closed tcp=ok serial=2023023207
NS
Pass
TCP connections
Good. All nameserver IPv4 addresses accept TCP connections on port 53.
edns1.ultradns.com 204.74.66.1 auth=ok recursion=closed tcp=ok serial=2023023207
edns1.ultradns.net 204.74.110.1 auth=ok recursion=closed tcp=ok serial=2023023207
ns-cloud-a1.googledomains.com 216.239.32.106 auth=ok recursion=closed tcp=ok serial=1
ns-cloud-a2.googledomains.com 216.239.34.106 auth=ok recursion=closed tcp=ok serial=1
oak.fastlydns.com 157.52.78.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.dev 157.52.79.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.net 167.82.228.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.org 167.82.229.5 auth=ok recursion=closed tcp=ok serial=2023023207
NS
Pass
Delegation mismatch
Good. NS records match between parent and authoritative servers.
NS
Warn
SOA serial consistency
SOA serial mismatch across IPv4 nameservers. This usually indicates that secondary nameservers are out of sync with the primary, causing inconsistent DNS responses.
edns1.ultradns.com 204.74.66.1 auth=ok recursion=closed tcp=ok serial=2023023207
edns1.ultradns.net 204.74.110.1 auth=ok recursion=closed tcp=ok serial=2023023207
ns-cloud-a1.googledomains.com 216.239.32.106 auth=ok recursion=closed tcp=ok serial=1
ns-cloud-a2.googledomains.com 216.239.34.106 auth=ok recursion=closed tcp=ok serial=1
oak.fastlydns.com 157.52.78.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.dev 157.52.79.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.net 167.82.228.5 auth=ok recursion=closed tcp=ok serial=2023023207
oak.fastlydns.org 167.82.229.5 auth=ok recursion=closed tcp=ok serial=2023023207
Category
Status
Test name
Information
SOA
Info
SOA record
SOA record details:
Primary NS : edns1.ultradns.com
Hostmaster : hostmaster@fastly.com
Serial : 2023023207
Refresh : 3600
Retry : 600
Expire : 604800
Min TTL : 60
SOA
Pass
SOA MNAME
OK. edns1.ultradns.com is listed in the NS records.
SOA
Info
SOA Serial
Current SOA serial is 2023023207. Format looks correct (YYYYMMDDnn).
SOA
Pass
SOA Refresh
Refresh: 3600 (1 hour(s)). OK. Within recommended 1 to 24 hours range.
SOA
Pass
SOA Retry
Retry: 600 (10 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.
Category
Status
Test name
Information
MX
Info
MX Records
Current MX records:
10 aspmx.l.google.com [192.178.164.27]
20 alt1.aspmx.l.google.com [172.253.145.26]
20 alt2.aspmx.l.google.com [172.253.135.26]
30 aspmx3.googlemail.com [172.253.135.26]
30 aspmx2.googlemail.com [172.253.145.26]
MX
Pass
MX count
Zone have 5 MX record(s). Good 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:
192.178.164.27 → yuphxer-in-f27.1e100.net
172.253.145.26 → yulnkjt-in-f26.1e100.net
172.253.135.26 → yudfwta-in-f26.1e100.net
172.253.135.26 → yudfwta-in-f26.1e100.net
172.253.145.26 → yulnkjt-in-f26.1e100.net
Category
Status
Test name
Information
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.
Category
Status
Test name
Information
WWW
Info
WWW A Record
www.fastly.com resolves to:
151.101.65.57
151.101.193.57
151.101.1.57
151.101.129.57
WWW
Info
WWW AAAA (IPv6)
IPv6 addresses:
2a04:4e42::313
2a04:4e42:600::313
2a04:4e42:200::313
2a04:4e42:400::313
WWW
Pass
WWW IPv4 addresses are public
Good. All WWW IPv4 addresses are public.
WWW
Info
WWW CNAME
www.fastly.com has a CNAME pointing to prod.www-fastly-com.map.fastly.net.
Processed in 0.849s · Real DNS resolution via dnspython · Wed, 23 Sep 2026 20:38:23 GMT