sling.com

Checked 22 October 2026, 10:44 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-09-12

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
12 September 1999
Last changed
8 September 2026
Expires
12 September 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns-1160.awsdns-17.org, ns-1600.awsdns-08.co.uk, ns-321.awsdns-40.com, ns-674.awsdns-20.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 2027-09-12 #3
    The registration is valid until 2027-09-12 (325 days).
  • ✓ Transfer locked #4
    Registry status: client transfer 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-1160.awsdns-17.org, ns-1600.awsdns-08.co.uk, ns-321.awsdns-40.com, ns-674.awsdns-20.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1160.awsdns-17.org, ns-1600.awsdns-08.co.uk, ns-321.awsdns-40.com, ns-674.awsdns-20.net
NS in the zone
ns-1160.awsdns-17.org, ns-1600.awsdns-08.co.uk, ns-321.awsdns-40.com, ns-674.awsdns-20.net
NameserverAddressesNetwork (AS)Glue
ns-1160.awsdns-17.org205.251.196.136 2600:9000:5304:8800::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1600.awsdns-08.co.uk205.251.198.64 2600:9000:5306:4000::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-321.awsdns-40.com205.251.193.65 2600:9000:5301:4100::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.193.65 2600:9000:5301:4100::1
ns-674.awsdns-20.net205.251.194.162 2600:9000:5302:a200::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1160.awsdns-17.org, ns-1600.awsdns-08.co.uk, ns-321.awsdns-40.com, ns-674.awsdns-20.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-1160.awsdns-17.org 205.251.196.136NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1160.awsdns-17.org 2600:9000:5304:8800::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1600.awsdns-08.co.uk 205.251.198.64NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1600.awsdns-08.co.uk 2600:9000:5306:4000::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-321.awsdns-40.com 205.251.193.65NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-321.awsdns-40.com 2600:9000:5301:4100::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-674.awsdns-20.net 205.251.194.162NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-674.awsdns-20.net 2600:9000:5302:a200::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-1600.awsdns-08.co.uk

Found

Primary (MNAME)
ns-1600.awsdns-08.co.uk
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-1160.awsdns-17.org (205.251.196.136)1
ns-1160.awsdns-17.org (2600:9000:5304:8800::1)1
ns-1600.awsdns-08.co.uk (205.251.198.64)1
ns-1600.awsdns-08.co.uk (2600:9000:5306:4000::1)1
ns-321.awsdns-40.com (205.251.193.65)1
ns-321.awsdns-40.com (2600:9000:5301:4100::1)1
ns-674.awsdns-20.net (205.251.194.162)1
ns-674.awsdns-20.net (2600:9000:5302:a200::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-1600.awsdns-08.co.uk 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

20 records at the apex

Found

Read from
205.251.196.136:53
TypeValueTTL
SOAns-1600.awsdns-08.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1160.awsdns-17.org.60
NSns-1600.awsdns-08.co.uk.60
NSns-321.awsdns-40.com.60
NSns-674.awsdns-20.net.60
A159.60.130.57300
MX10 mxa-00115406.gslb.pphosted.com.300
MX10 mxb-00115406.gslb.pphosted.com.300
TXT"atlassian-domain-verification=Y1DZ0UPOFV2VdKPhbRGtCXtKD67GWujFfZqVQTra97PBar5Xlv86QH/IR9CYm5TG"3600
TXT"box-domain-verification=5c0186bf0d554154f8d6947954ac49dee8c9a4a8c5e22df025788031f25ac14f"3600
TXT"facebook-domain-verification=tv4ruws7s7jz2xy3cxmxi9054yutfu"3600
TXT"google-site-verification=2cxWm3BG3zEqY1r5EmhtXvgOYfM0WjV8b4RVIyFso5g"3600
TXT"google-site-verification=738RVy0BjL2ma5o-Xngs9V_qjVEjFutbuNBXOZK46JY"3600
TXT"google-site-verification=OK6b8p6Qc3IFyYtHrdS5JPSNM7Ua3d2xh0fRL9YquBA"3600
TXT"google-site-verification=QpYwOJfaDVPQ15nTZulJqns5RqLfu2SGfcfJZFE_B94"3600
TXT"google-site-verification=UE772yXjsDrYvvjTUg_YQcUU877xA4dpprLUt2SxJX4"3600
TXT"google-site-verification=osq2tlozvWdS1nEAXBFXMQvjaWrZPbD1pMhMOI6rt_0"3600
TXT"knowbe4-site-verification=39de291b66a7affe8c46a787c937f52f"3600
TXT"v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com ~all"3600
TXT"v=verifydomain MS=ms93112595"3600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: 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