Skip to results
IntoDNS.run
Domainstackoverflow.com
✓ 23 Pass ⚠ 2 Warn ℹ 8 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.
PARENT
Info
Parent delegation records
Delegation NS records returned by parent zone com (a.gtld-servers.net):
sureena.ns.cloudflare.comglue=[108.162.194.126, 162.159.38.126, 172.64.34.126, 2606:4700:50::a29f:267e, 2803:f800:50::6ca2:c27e, 2a06:98c1:50::ac40:227e] resolved=[172.64.34.126, 108.162.194.126, 162.159.38.126, 2a06:98c1:50::ac40:227e, 2606:4700:50::a29f:267e, 2803:f800:50::6ca2:c27e][TTL=172800] damian.ns.cloudflare.comglue=[108.162.195.50, 162.159.44.50, 172.64.35.50, 2606:4700:58::a29f:2c32, 2803:f800:50::6ca2:c332, 2a06:98c1:50::ac40:2332] resolved=[162.159.44.50, 172.64.35.50, 108.162.195.50, 2606:4700:58::a29f:2c32, 2803:f800:50::6ca2:c332, 2a06:98c1:50::ac40:2332][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.
damian.ns.cloudflare.com[162.159.44.50, 172.64.35.50, 108.162.195.50][TTL=21600] sureena.ns.cloudflare.com[172.64.34.126, 108.162.194.126, 162.159.38.126][TTL=21600]
NS
Pass
Recursive queries
Good. The nameservers do not allow recursive queries for outside hosts.
damian.ns.cloudflare.com 162.159.44.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 172.64.35.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 108.162.195.50 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 172.64.34.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 108.162.194.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 162.159.38.126 auth=ok recursion=closed tcp=ok serial=2415505570
NS
Pass
Multiple nameservers
OK. It have 2 nameservers (minimum is 2).
NS
Pass
Different subnets
Good. Nameservers are on 6 different subnets.
NS
Pass
Public IPs
Good. All nameserver IPv4 addresses are public.
NS
Pass
DNS servers responded
Good. All nameserver IPv4 addresses responded.
damian.ns.cloudflare.com 162.159.44.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 172.64.35.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 108.162.195.50 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 172.64.34.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 108.162.194.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 162.159.38.126 auth=ok recursion=closed tcp=ok serial=2415505570
NS
Pass
TCP connections
Good. All nameserver IPv4 addresses accept TCP connections on port 53.
damian.ns.cloudflare.com 162.159.44.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 172.64.35.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 108.162.195.50 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 172.64.34.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 108.162.194.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 162.159.38.126 auth=ok recursion=closed tcp=ok serial=2415505570
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: 2415505570.
damian.ns.cloudflare.com 162.159.44.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 172.64.35.50 auth=ok recursion=closed tcp=ok serial=2415505570 damian.ns.cloudflare.com 108.162.195.50 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 172.64.34.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 108.162.194.126 auth=ok recursion=closed tcp=ok serial=2415505570 sureena.ns.cloudflare.com 162.159.38.126 auth=ok recursion=closed tcp=ok serial=2415505570
SOA
Info
SOA record
SOA record details:
Primary NS : damian.ns.cloudflare.com Hostmaster : dns@cloudflare.com Serial : 2415505570 Refresh : 10000 Retry : 2400 Expire : 604800 Min TTL : 1800
SOA
Pass
SOA MNAME
OK. damian.ns.cloudflare.com is listed in the NS records.
SOA
Info
SOA Serial
Current SOA serial is 2415505570. RFC 1912 recommends the YYYYMMDDnn date-based format(Year-Month-Day-Revision).
SOA
Pass
SOA Refresh
Refresh: 10000 (2 hour(s)). OK. Within recommended 1 to 24 hours range.
SOA
Pass
SOA Retry
Retry: 2400 (40 min(s)). OK.
SOA
Pass
SOA Expire
Expire: 604800 (7 day(s)). OK.
SOA
Pass
SOA Minimum TTL
Min TTL: 1800 (30 min(s)). OK. RFC2308 recommends 1-3 hours for negative caching.
MX
Info
MX Records
Current MX records:
1 aspmx.l.google.com [192.178.164.27] 5 alt2.aspmx.l.google.com [172.253.135.26] 5 alt1.aspmx.l.google.com [172.253.145.26] 10 alt4.aspmx.l.google.com [142.251.96.27] 10 alt3.aspmx.l.google.com [173.194.42.26]
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 172.253.135.26 → yudfwta-in-f26.1e100.net 172.253.145.26 → yulnkjt-in-f26.1e100.net 142.251.96.27 → yutulth-in-f27.1e100.net 173.194.42.26 → yucbfwv-in-f26.1e100.net
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.stackoverflow.com resolves to:
198.252.206.1
WWW
Info
WWW AAAA (IPv6)
No IPv6 AAAA record found for www.stackoverflow.com. IPv6 is optional and not used for pass/fail status.
WWW
Pass
WWW IPv4 addresses are public
Good. All WWW IPv4 addresses are public.
WWW
Pass
WWW CNAME
OK. www resolves via A record directly.
Processed in 0.331s · Real DNS resolution via dnspython · Wed, 23 Sep 2026 20:34:25 GMT