iflscience.com

Checked 22 October 2026, 09:15 UTC · via 8.8.8.8
!Passed with warnings
25 passed 3 warnings 0 failed 3 info

Registration

warn

.com generic · GoDaddy.com, LLC · expires 2026-11-11

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
GoDaddy.com, LLC
Registered
18 September 2012
Last changed
9 November 2023
Expires
11 November 2026
Status
client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns-1468.awsdns-55.org, ns-1564.awsdns-03.co.uk, ns-507.awsdns-63.com, ns-652.awsdns-17.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 in 20 days
    The registration expires on 2026-11-11. Make sure it is renewed.
    #3
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client renew prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns-1468.awsdns-55.org, ns-1564.awsdns-03.co.uk, ns-507.awsdns-63.com, ns-652.awsdns-17.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1468.awsdns-55.org, ns-1564.awsdns-03.co.uk, ns-507.awsdns-63.com, ns-652.awsdns-17.net
NS in the zone
ns-1468.awsdns-55.org, ns-1564.awsdns-03.co.uk, ns-507.awsdns-63.com, ns-652.awsdns-17.net
NameserverAddressesNetwork (AS)Glue
ns-1468.awsdns-55.org205.251.197.188 2600:9000:5305:bc00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1564.awsdns-03.co.uk205.251.198.28 2600:9000:5306:1c00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-507.awsdns-63.com205.251.193.251 2600:9000:5301:fb00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.193.251 2600:9000:5301:fb00::1
ns-652.awsdns-17.net205.251.194.140 2600:9000:5302:8c00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1468.awsdns-55.org, ns-1564.awsdns-03.co.uk, ns-507.awsdns-63.com, ns-652.awsdns-17.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-1468.awsdns-55.org 205.251.197.188NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1468.awsdns-55.org 2600:9000:5305:bc00::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1564.awsdns-03.co.uk 205.251.198.28NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1564.awsdns-03.co.uk 2600:9000:5306:1c00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-507.awsdns-63.com 205.251.193.251NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-507.awsdns-63.com 2600:9000:5301:fb00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-652.awsdns-17.net 205.251.194.140NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-652.awsdns-17.net 2600:9000:5302:8c00::1NOERROR, 4 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

pass

serial 1 · primary ns-652.awsdns-17.net

Found

Primary (MNAME)
ns-652.awsdns-17.net
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1468.awsdns-55.org (205.251.197.188)1
ns-1468.awsdns-55.org (2600:9000:5305:bc00::1)1
ns-1564.awsdns-03.co.uk (205.251.198.28)1
ns-1564.awsdns-03.co.uk (2600:9000:5306:1c00::1)1
ns-507.awsdns-63.com (205.251.193.251)1
ns-507.awsdns-63.com (2600:9000:5301:fb00::1)1
ns-652.awsdns-17.net (205.251.194.140)1
ns-652.awsdns-17.net (2600:9000:5302:8c00::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-652.awsdns-17.net 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

19 records at the apex

Found

Read from
205.251.197.188:53
TypeValueTTL
SOAns-652.awsdns-17.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1468.awsdns-55.org.60
NSns-1564.awsdns-03.co.uk.60
NSns-507.awsdns-63.com.60
NSns-652.awsdns-17.net.60
A18.66.122.1960
A18.66.122.5060
A18.66.122.8160
A18.66.122.12060
MX0 iflscience-com.mail.protection.outlook.com.3600
TXT"MS=ms97297058"60
TXT"atlassian-domain-verification=Rsm7NYeI6lDurJ2WeshJx2VmByR5noPtq4qbF9zvgKcAsNifeApFGC5VJdVkMeBj"60
TXT"google-site-verification=PWNiOVgSZ3DXJDbIxHgny0urIR05bN6DCS-yTZZ47Jw"60
TXT"google-site-verification=bAkGbUibS6t6WLWFFz_5DGISZZmsTZ9TLVt4_uQI5Ug"60
TXT"google-site-verification=r7Ok8ZWd5YGfjqBeIPRkE0UIq1TtL4XF8-9rTOHL7aE"60
TXT"google-site-verification=xZghqV1nD6ot2MCUihM_47toVFFmratsvG69Gi-k1kE"60
TXT"google-site-verification=x_XSnS5PkDA7xMzP3D5NAE4BUR8SRY5PTj7zK2OpFeM"60
TXT"mandrill_verify.RgZ3LtkHxNR4sMeRcp1p3w"60
TXT"v=spf1 a ip4:216.208.153.97 ip4:216.223.155.112/28 ip4:66.159.123.64/28 ip4:198.2.188.112 include:amazonses.com include:spf.protection.outlook.com ip4:88.151.128.0/21 include:servers.mcsv.net include:_spf.spotme.com " "include:20033579.spf08.hubspotemail.net ~all"60

Checks

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