ishares.com

Checked 22 October 2026, 09:22 UTC · via 8.8.8.8
!Passed with warnings
28 passed 3 warnings 0 failed 4 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-09-20

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
14 June 1998
Last changed
13 March 2023
Expires
20 September 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns1.blackrock.com, ns2.blackrock.com, ns3.blackrock.com, ns4.blackrock.com, ns5.blackrock.com, ns6.blackrock.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 2027-09-20 #3
    The registration is valid until 2027-09-20 (333 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

warn

ns1.blackrock.com, ns2.blackrock.com, ns3.blackrock.com, ns4.blackrock.com, ns5.blackrock.com, ns6.blackrock.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.blackrock.com, ns2.blackrock.com, ns3.blackrock.com, ns4.blackrock.com, ns5.blackrock.com, ns6.blackrock.com
NS in the zone
ns1.blackrock.com, ns2.blackrock.com, ns3.blackrock.com, ns4.blackrock.com, ns5.blackrock.com, ns6.blackrock.com
NameserverAddressesNetwork (AS)Glue
ns1.blackrock.com193.108.91.23AS21342 AKAMAI-ASN2 - Akamai International B.V., NL193.108.91.23
ns2.blackrock.com96.7.49.67AS21342 AKAMAI-ASN2 - Akamai International B.V., NL96.7.49.67
ns3.blackrock.com23.61.199.64AS21342 AKAMAI-ASN2 - Akamai International B.V., NL23.61.199.64
ns4.blackrock.com184.26.160.66AS21342 AKAMAI-ASN2 - Akamai International B.V., NL184.26.160.66
ns5.blackrock.com23.211.132.67AS21342 AKAMAI-ASN2 - Akamai International B.V., NL23.211.132.67
ns6.blackrock.com95.100.173.65AS21342 AKAMAI-ASN2 - Akamai International B.V., NL95.100.173.65

Checks

  • ✓ 6 nameservers #6
    Delegated to ns1.blackrock.com, ns2.blackrock.com, ns3.blackrock.com, ns4.blackrock.com, ns5.blackrock.com, ns6.blackrock.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 6 IPv4 /24s and 0 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 6 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

warn

6 of 6 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.blackrock.com 193.108.91.23NOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
ns2.blackrock.com 96.7.49.67NOERROR, 3 ms, authoritativenoyes / yesrefused41824.9
ns3.blackrock.com 23.61.199.64NOERROR, 3 ms, authoritativenoyes / yesrefused41824.7
ns4.blackrock.com 184.26.160.66NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
ns5.blackrock.com 23.211.132.67NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32
ns6.blackrock.com 95.100.173.65NOERROR, 5 ms, authoritativenoyes / yesrefused48878.31

Checks

  • ✓ All respond #14
    All 6 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns1.blackrock.com: "41824.5"; ns2.blackrock.com: "41824.9"; ns3.blackrock.com: "41824.7"; ns4.blackrock.com: "48878.31"; ns5.blackrock.com: "48878.32"; ns6.blackrock.com: "48878.31". Hide or replace the version string.
    #17
  • ✓ 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 2026061409 · primary ns1.blackrock.com

Found

Primary (MNAME)
ns1.blackrock.com
Contact (RNAME)
netops.blackrock.com
Serial
2026061409
Refresh / retry
3600 s / 900 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.blackrock.com (193.108.91.23)2026061409
ns2.blackrock.com (96.7.49.67)2026061409
ns3.blackrock.com (23.61.199.64)2026061409
ns4.blackrock.com (184.26.160.66)2026061409
ns5.blackrock.com (23.211.132.67)2026061409
ns6.blackrock.com (95.100.173.65)2026061409

Checks

  • ✓ Serial 2026061409 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 15m, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.blackrock.com is one of the listed nameservers.
  • ✓ Contact netops@blackrock.com #25
    The SOA RNAME netops.blackrock.com means netops@blackrock.com.
  • ✓ Date-based serial #26
    The serial 2026061409 follows the YYYYMMDDnn convention (2026-06-14).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
0 iterations, 0-byte salt
Signatures valid until
25 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
28767ECDSAP256SHA256 (13)SHA256 B9B4A2CB62D967F6…yes

DNSKEY in the zone

Key tagRoleAlgorithm
54740ZSK (256)ECDSAP256SHA256 (13)
16359KSK (257)ECDSAP256SHA256 (13)
28767KSK (257)ECDSAP256SHA256 (13)
39599ZSK (256)ECDSAP256SHA256 (13)

Checks

  • ✓ Signed and validated #27
    The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
  • ✓ DS matches a key #28
    The DS record at the parent matches a key in the zone: key tag 28767 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 73h0m0s and created on demand; the current one was made at 2026-10-22 03:33 UTC and expires at 2026-10-25 04:33 UTC.
  • ✓ NSEC3 as recommended #31
    The zone uses NSEC3 with 0 iterations and no salt (RFC 9276).

Records

warn

21 records at the apex

Found

Read from
193.108.91.23:53
TypeValueTTL
SOAns1.blackrock.com. netops.blackrock.com. 2026061409 3600 900 604800 36003600
NSns4.blackrock.com.86400
NSns2.blackrock.com.86400
NSns3.blackrock.com.86400
NSns1.blackrock.com.86400
NSns5.blackrock.com.86400
NSns6.blackrock.com.86400
A104.101.238.7020
MX10 mxb-00162b01.gslb.pphosted.com.1800
MX10 mxa-00162b01.gslb.pphosted.com.1800
MX20 mx0b-00162b01.pphosted.com.1800
MX20 mx0a-00162b01.pphosted.com.1800
TXT"_4424hfp3k1nxlxej33mqog2781kkyea"300
TXT"v=spf1 +mx -all"300
TXT"google-site-verification=jDYaYb5xxFKW8YaL87gpssWibvTaWxeiP8wpT4AIcAI"300
TXT"facebook-domain-verification=fqxv6r9387l2g5yx5l9f026wsi84lw"300
TXT"0f1815be-65d1-4cbf-9fda-f331702621b5"300
TXT"_qmfelu6tly2mtpmwwedxuy0umu3uy88"300
TXT"F0DB-75B3-04DE-9801-788E-A7F1-29F8-D61D"300
TXT"MS=ms49010423"300
TXT"_k4ebro87a8cppc6jht4y8hsttf8oosv"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s). 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