rcm-fe.amazon-adsystem.com

Zone amazon-adsystem.com · Checked 22 October 2026, 10:25 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-09-16

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
16 September 2011
Last changed
31 July 2026
Expires
16 September 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns-1532.awsdns-63.org, ns-2034.awsdns-62.co.uk, ns-249.awsdns-31.com, ns-806.awsdns-36.net
RDAP server
https://rdap.verisign.com/com/v1/

Checks

  • i
    .com is a generic TLD (gTLD)
    Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.
    #1
  • ✓ TLD delegated and signed #2
    .com is delegated in the root zone and DNSSEC-signed.
  • ✓ Expires on 2027-09-16 #3
    The registration is valid until 2027-09-16 (329 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns-1532.awsdns-63.org, ns-2034.awsdns-62.co.uk, ns-249.awsdns-31.com, ns-806.awsdns-36.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1532.awsdns-63.org, ns-2034.awsdns-62.co.uk, ns-249.awsdns-31.com, ns-806.awsdns-36.net
NS in the zone
ns-1532.awsdns-63.org, ns-2034.awsdns-62.co.uk, ns-249.awsdns-31.com, ns-806.awsdns-36.net
NameserverAddressesNetwork (AS)Glue
ns-1532.awsdns-63.org205.251.197.252 2600:9000:5305:fc00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-2034.awsdns-62.co.uk205.251.199.242 2600:9000:5307:f200::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-249.awsdns-31.com205.251.192.249 2600:9000:5300:f900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.249 2600:9000:5300:f900::1
ns-806.awsdns-36.net205.251.195.38 2600:9000:5303:2600::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1532.awsdns-63.org, ns-2034.awsdns-62.co.uk, ns-249.awsdns-31.com, ns-806.awsdns-36.net.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ No glue needed #8
    All nameservers are outside the zone, so no glue records are needed.
  • ✓ All names resolve #9
    Every nameserver name has an address and is not an alias.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, Inc., US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-1532.awsdns-63.org 205.251.197.252NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1532.awsdns-63.org 2600:9000:5305:fc00::1NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns-2034.awsdns-62.co.uk 205.251.199.242NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-2034.awsdns-62.co.uk 2600:9000:5307:f200::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-249.awsdns-31.com 205.251.192.249NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-249.awsdns-31.com 2600:9000:5300:f900::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-806.awsdns-36.net 205.251.195.38NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-806.awsdns-36.net 2600:9000:5303:2600::1NOERROR, 5 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 nameserver addresses answered.
  • ✓ All authoritative #15
    Every responding nameserver answers authoritatively for the zone.
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • ✓ No version disclosed #17
    The nameservers don't reveal their software version.
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✓ TCP supported #19
    All nameservers answer over TCP.
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

warn

serial 201 · primary dns-external-route53.us-east-1.amazonaws.com

Found

Primary (MNAME)
dns-external-route53.us-east-1.amazonaws.com
Contact (RNAME)
root.amazon.com
Serial
201
Refresh / retry
3600 s / 900 s
Expire
604800 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
ns-1532.awsdns-63.org (205.251.197.252)201
ns-1532.awsdns-63.org (2600:9000:5305:fc00::1)201
ns-2034.awsdns-62.co.uk (205.251.199.242)201
ns-2034.awsdns-62.co.uk (2600:9000:5307:f200::1)201
ns-249.awsdns-31.com (205.251.192.249)201
ns-249.awsdns-31.com (2600:9000:5300:f900::1)201
ns-806.awsdns-36.net (205.251.195.38)201
ns-806.awsdns-36.net (2600:9000:5303:2600::1)201

Checks

  • ✓ Serial 201 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 1h, retry 15m, expire 7d, negative TTL 1m.
    #23
  • i
    Hidden master (not resolvable)
    The primary nameserver dns-external-route53.us-east-1.amazonaws.com is not listed as a nameserver and does not resolve publicly: a hidden master, or a placeholder name. Some tools (e.g. dynamic updates) use MNAME to find the primary.
    #24
  • ✓ Contact root@amazon.com #25
    The SOA RNAME root.amazon.com means root@amazon.com.
  • ✓ Counter serial #26
    The serial 201 is a plain counter.

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

info

9 records at the apex

Found

Read from
205.251.197.252:53
TypeValueTTL
SOAdns-external-route53.us-east-1.amazonaws.com. root.amazon.com. 201 3600 900 604800 607200
NSns-1532.awsdns-63.org.7200
NSns-2034.awsdns-62.co.uk.7200
NSns-249.awsdns-31.com.7200
NSns-806.awsdns-36.net.7200
A52.205.243.115900
A54.145.59.57900
A52.200.46.40900
TXT"v=spf1 -all"900

Checks

  • ✓ TTLs within range #32
    TTLs: A 15m, NS 2h. The NS TTL at the parent is 2d and in the zone 2h; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • i
    No CAA records
    Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.
    #35