sparknotes.com

Checked 22 October 2026, 10:46 UTC · via 8.8.8.8
✗Problems found
22 passed 2 warnings 1 failed 6 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-09-23

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
6 March 1999
Last changed
19 September 2026
Expires
23 September 2027
Status
client transfer prohibited
Registry nameservers
mail9th1.barnesandnoble.com, ns2.barnesandnoble.com, ns3.barnesandnoble.com, ns4.barnesandnoble.com
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 2027-09-23 #3
    The registration is valid until 2027-09-23 (336 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

warn

mail9th1.barnesandnoble.com, ns2.barnesandnoble.com, ns3.barnesandnoble.com, ns4.barnesandnoble.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
mail9th1.barnesandnoble.com, ns2.barnesandnoble.com, ns3.barnesandnoble.com, ns4.barnesandnoble.com
NS in the zone
mail9th1.barnesandnoble.com, ns2.barnesandnoble.com, ns3.barnesandnoble.com, ns4.barnesandnoble.com
NameserverAddressesNetwork (AS)Glue
mail9th1.barnesandnoble.com161.221.74.77AS39960 BARNES-AND-NOBLE - Barnes & Noble Inc., US161.221.74.77
ns2.barnesandnoble.com161.221.74.78AS39960 BARNES-AND-NOBLE - Barnes & Noble Inc., US161.221.74.78
ns3.barnesandnoble.com65.204.48.77AS39960 BARNES-AND-NOBLE - Barnes & Noble Inc., US65.204.48.77
ns4.barnesandnoble.com65.204.48.80AS39960 BARNES-AND-NOBLE - Barnes & Noble Inc., US65.204.48.80

Checks

  • ✓ 4 nameservers #6
    Delegated to mail9th1.barnesandnoble.com, ns2.barnesandnoble.com, ns3.barnesandnoble.com, ns4.barnesandnoble.com.
  • ✓ 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 2 IPv4 /24s and 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS39960 (BARNES-AND-NOBLE - Barnes & Noble Inc., US): 4 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • i
    All nameserver names under .com
    All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.
    #12
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

fail

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
mail9th1.barnesandnoble.com 161.221.74.77NOERROR, 86 ms, authoritativenoyes / yesrefused[secured]
ns2.barnesandnoble.com 161.221.74.78NOERROR, 85 ms, authoritativenoyes / yesrefused[secured]
ns3.barnesandnoble.com 65.204.48.77NOERROR, 88 ms, authoritativenoyes / yesALLOWED (56 records)[secured]
ns4.barnesandnoble.com 65.204.48.80NOERROR, 88 ms, authoritativenoyes / yesALLOWED (56 records)[secured]

Checks

  • ✓ All respond #14
    All 4 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: mail9th1.barnesandnoble.com: "[secured]"; ns2.barnesandnoble.com: "[secured]"; ns3.barnesandnoble.com: "[secured]"; ns4.barnesandnoble.com: "[secured]".
    #17
  • ✗
    Zone transfer allowed
    These nameservers send the complete zone to anyone who asks (AXFR), exposing all host names: ns3.barnesandnoble.com (65.204.48.77): 56 records; ns4.barnesandnoble.com (65.204.48.80): 56 records. Restrict zone transfers to your secondary servers.
    #18
  • ✓ 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

info

serial 2026100800 · primary pnjmasterns01.barnesandnoble.com

Found

Primary (MNAME)
pnjmasterns01.barnesandnoble.com
Contact (RNAME)
domainadmin.book.com
Serial
2026100800
Refresh / retry
7200 s / 3600 s
Expire
2592000 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
mail9th1.barnesandnoble.com (161.221.74.77)2026100800
ns2.barnesandnoble.com (161.221.74.78)2026100800
ns3.barnesandnoble.com (65.204.48.77)2026100800
ns4.barnesandnoble.com (65.204.48.80)2026100800

Checks

  • ✓ Serial 2026100800 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 1h, expire 30d, negative TTL 1h.
  • i
    Hidden master (not resolvable)
    The primary nameserver pnjmasterns01.barnesandnoble.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 domainadmin@book.com #25
    The SOA RNAME domainadmin.book.com means domainadmin@book.com.
  • ✓ Date-based serial #26
    The serial 2026100800 follows the YYYYMMDDnn convention (2026-10-08).

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

14 records at the apex

Found

Read from
161.221.74.77:53
TypeValueTTL
SOApnjmasterns01.barnesandnoble.com. domainadmin.book.com. 2026100800 7200 3600 2592000 36003600
NSns3.barnesandnoble.com.3600
NSns2.barnesandnoble.com.3600
NSmail9th1.barnesandnoble.com.3600
NSns4.barnesandnoble.com.3600
A65.204.48.118600
A161.221.74.213600
MX10 mxb-00189e01.gslb.pphosted.com.900
MX10 mxa-00189e01.gslb.pphosted.com.900
TXT"MS=ms56458472"3600
TXT"uj0Q21bEiaQelRZbQ/S1tW0ybQGz3gvPZK23zNL3aXJUgDwU41O7uA+8sAqCmPTM6mPosAIm1S8oXe8Iglc9/A=="3600
TXT"stripe-verification=8ddba2709cffbeabf91bf6ac68001a18bc3570a1daf8070f676801d0bd20665d"3600
TXT"v=spf1 mx include:spf-00189e01.pphosted.com include:spf.protection.outlook.com include:spf.mandrillapp.com ~all"3600
TXT"q26up9akffho7d1v6kt71pse20"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 15m, NS 1h. The NS TTL at the parent is 2d and in the zone 1h; 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