visualstudio.com

Checked 22 October 2026, 11:22 UTC · via 8.8.8.8
!Passed with warnings
25 passed 3 warnings 0 failed 3 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-03-19

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
18 March 1997
Last changed
15 February 2026
Expires
19 March 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1-07.azure-dns.com, ns2-07.azure-dns.net, ns3-07.azure-dns.org, ns4-07.azure-dns.info
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 2027-03-19 #3
    The registration is valid until 2027-03-19 (147 days).
  • ✓ Transfer locked #4
    Registry status: client delete 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

ns1-07.azure-dns.com, ns2-07.azure-dns.net, ns3-07.azure-dns.org, ns4-07.azure-dns.info

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1-07.azure-dns.com, ns2-07.azure-dns.net, ns3-07.azure-dns.org, ns4-07.azure-dns.info
NS in the zone
ns1-07.azure-dns.com, ns2-07.azure-dns.net, ns3-07.azure-dns.org, ns4-07.azure-dns.info
NameserverAddressesNetwork (AS)Glue
ns1-07.azure-dns.com13.107.236.7 2603:1061:0:700::7AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US13.107.236.7 2603:1061:0:700::7
ns2-07.azure-dns.net150.171.21.7 2620:1ec:8ec:700::7AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns3-07.azure-dns.org204.14.183.7 2a01:111:4000:700::7AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns4-07.azure-dns.info208.84.5.7 2620:1ec:bda:700::7AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1-07.azure-dns.com, ns2-07.azure-dns.net, ns3-07.azure-dns.org, ns4-07.azure-dns.info.
  • ✓ 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 (AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, 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, .info, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1-07.azure-dns.com 13.107.236.7NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1-07.azure-dns.com 2603:1061:0:700::7NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2-07.azure-dns.net 150.171.21.7NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2-07.azure-dns.net 2620:1ec:8ec:700::7NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3-07.azure-dns.org 204.14.183.7NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3-07.azure-dns.org 2a01:111:4000:700::7NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns4-07.azure-dns.info 208.84.5.7NOERROR, 5 ms, authoritativenoyes / yesrefusedKnot DNS 3.1.2.1770717641.d6b376aff
ns4-07.azure-dns.info 2620:1ec:bda:700::7NOERROR, 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: ns4-07.azure-dns.info: "Knot DNS 3.1.2.1770717641.d6b376aff". 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

warn

serial 790367 · primary ns1-07.azure-dns.com

Found

Primary (MNAME)
ns1-07.azure-dns.com
Contact (RNAME)
msnhst.microsoft.com
Serial
790367
Refresh / retry
900 s / 300 s
Expire
604800 s
Negative TTL
60 s

Serial per nameserver

NameserverSerial
ns1-07.azure-dns.com (13.107.236.7)790367
ns1-07.azure-dns.com (2603:1061:0:700::7)790367
ns2-07.azure-dns.net (150.171.21.7)790367
ns2-07.azure-dns.net (2620:1ec:8ec:700::7)790367
ns3-07.azure-dns.org (204.14.183.7)790367
ns3-07.azure-dns.org (2a01:111:4000:700::7)790367
ns4-07.azure-dns.info (208.84.5.7)790367
ns4-07.azure-dns.info (2620:1ec:bda:700::7)790367

Checks

  • ✓ Serial 790367 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d; negative caching TTL (minimum) 1m is outside 5m–1d (RFC 2308 recommends 1–3 hours). Current values: refresh 15m, retry 5m, expire 7d, negative TTL 1m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1-07.azure-dns.com is one of the listed nameservers.
  • ✓ Contact msnhst@microsoft.com #25
    The SOA RNAME msnhst.microsoft.com means msnhst@microsoft.com.
  • ✓ Counter serial #26
    The serial 790367 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

info

11 records at the apex

Found

Read from
13.107.236.7:53
TypeValueTTL
SOAns1-07.azure-dns.com. msnhst.microsoft.com. 790367 900 300 604800 603600
NSns1-07.azure-dns.com.300
NSns2-07.azure-dns.net.300
NSns3-07.azure-dns.org.300
NSns4-07.azure-dns.info.300
A150.171.73.163600
A150.171.74.163600
AAAA2603:1061:10::163600
AAAA2603:1061:10:1::163600
TXT"v=spf1 -all"3600
CAA0 contactemail "caarecordaware@microsoft.com"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 1h, AAAA 1h, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: .