prezi.com

Checked 22 October 2026, 10:21 UTC · via 8.8.8.8
!Passed with warnings
25 passed 3 warnings 0 failed 3 info

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2027-08-24

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Amazon Registrar, Inc.
Registered
24 August 2000
Last changed
20 July 2026
Expires
24 August 2027
Status
client transfer prohibited
Registry nameservers
ns-1218.awsdns-24.org, ns-1914.awsdns-47.co.uk, ns-422.awsdns-52.com, ns-554.awsdns-05.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 2027-08-24 #3
    The registration is valid until 2027-08-24 (305 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns-1218.awsdns-24.org, ns-1914.awsdns-47.co.uk, ns-422.awsdns-52.com, ns-554.awsdns-05.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1218.awsdns-24.org, ns-1914.awsdns-47.co.uk, ns-422.awsdns-52.com, ns-554.awsdns-05.net
NS in the zone
ns-1218.awsdns-24.org, ns-1914.awsdns-47.co.uk, ns-422.awsdns-52.com, ns-554.awsdns-05.net
NameserverAddressesNetwork (AS)Glue
ns-1218.awsdns-24.org205.251.196.194 2600:9000:5304:c200::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1914.awsdns-47.co.uk205.251.199.122 2600:9000:5307:7a00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-422.awsdns-52.com205.251.193.166 2600:9000:5301:a600::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.193.166 2600:9000:5301:a600::1
ns-554.awsdns-05.net205.251.194.42 2600:9000:5302:2a00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1218.awsdns-24.org, ns-1914.awsdns-47.co.uk, ns-422.awsdns-52.com, ns-554.awsdns-05.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-1218.awsdns-24.org 205.251.196.194NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1218.awsdns-24.org 2600:9000:5304:c200::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1914.awsdns-47.co.uk 205.251.199.122NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1914.awsdns-47.co.uk 2600:9000:5307:7a00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-422.awsdns-52.com 205.251.193.166NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-422.awsdns-52.com 2600:9000:5301:a600::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-554.awsdns-05.net 205.251.194.42NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-554.awsdns-05.net 2600:9000:5302:2a00::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 1 · primary ns-422.awsdns-52.com

Found

Primary (MNAME)
ns-422.awsdns-52.com
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
150 s

Serial per nameserver

NameserverSerial
ns-1218.awsdns-24.org (205.251.196.194)1
ns-1218.awsdns-24.org (2600:9000:5304:c200::1)1
ns-1914.awsdns-47.co.uk (205.251.199.122)1
ns-1914.awsdns-47.co.uk (2600:9000:5307:7a00::1)1
ns-422.awsdns-52.com (205.251.193.166)1
ns-422.awsdns-52.com (2600:9000:5301:a600::1)1
ns-554.awsdns-05.net (205.251.194.42)1
ns-554.awsdns-05.net (2600:9000:5302:2a00::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    negative caching TTL (minimum) 2m30s is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 2h, retry 15m, expire 14d, negative TTL 2m30s.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-422.awsdns-52.com is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 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

warn

23 records at the apex

Found

Read from
205.251.196.194:53
TypeValueTTL
SOAns-422.awsdns-52.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 150900
NSns-1218.awsdns-24.org.86400
NSns-1914.awsdns-47.co.uk.86400
NSns-422.awsdns-52.com.86400
NSns-554.awsdns-05.net.86400
A75.2.83.248300
A99.83.220.209300
MX1 aspmx.l.google.com.150
MX10 aspmx2.googlemail.com.150
MX10 aspmx3.googlemail.com.150
MX5 alt1.aspmx.l.google.com.150
MX5 alt2.aspmx.l.google.com.150
TXT"MS=FE317A5F7628D7FDB19799B2977C89BCF07424CF"3600
TXT"TAILSCALE-n17Y01g0LreSmWd6TMsm"3600
TXT"cisco-ci-domain-verification=1e8b2296c92604216973a2c57b095fecdcf6c3c8e266e733c889f35a89947c0b"3600
TXT"cisco-ci-domain-verification=61f1f26b04c160b447ea2b9f66645e2260bdf79e0de78fbbeb86ef0c415e2764"3600
TXT"google-site-verification=3r5bfQ0C3sPh2RGY7OKZs93OSApxC1LCRV3PPzs1V3U"3600
TXT"notion-domain-verification=ms2YzzIhtVeXVcuzJfTyRwwKiZWNDXmBasIHihdn3GZ"3600
TXT"openai-domain-verification=dv-U71qSKn7QGknojN7VV8BW0n7"3600
TXT"ps-cd-verification=b3f86f9a-6576-4897-a042-e3f9b8291691"3600
TXT"v=spf1 ip4:82.150.225.79/32 ip4:52.38.191.241 mx include:_spf.google.com include:et._spf.pardot.com include:mailgun.org include:20307117.spf08.hubspotemail.net ~all"3600
TXT"wiz-domain-verification=d4f9f0c42831a322d3dff1868dfe8b55fe51c3a893feec5cd5940a14e1b29114"3600
TXT"zf7xczdk5287bv7spzbldgxy4zch353q"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (2m30s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
    #32
  • ✓ 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