yammer.com

Checked 22 October 2026, 11:36 UTC · via 8.8.8.8
!Passed with warnings
27 passed 3 warnings 0 failed 1 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-06-03

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
4 June 1997
Last changed
2 May 2026
Expires
3 June 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
a1-115.akam.net, a16-66.akam.net, a18-67.akam.net, a28-64.akam.net, a5-65.akam.net, a9-66.akam.net, ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.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 2027-06-03 #3
    The registration is valid until 2027-06-03 (223 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

pass

a1-115.akam.net, a16-66.akam.net, a18-67.akam.net, a28-64.akam.net, a5-65.akam.net, a9-66.akam.net, ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-115.akam.net, a16-66.akam.net, a18-67.akam.net, a28-64.akam.net, a5-65.akam.net, a9-66.akam.net, ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info
NS in the zone
a1-115.akam.net, a16-66.akam.net, a18-67.akam.net, a28-64.akam.net, a5-65.akam.net, a9-66.akam.net, ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.azure-dns.info
NameserverAddressesNetwork (AS)Glue
a1-115.akam.net193.108.91.115 2600:1401:2::73AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a16-66.akam.net23.211.132.66 2600:1406:1b::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-67.akam.net95.101.36.67 2600:1480:4800::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a28-64.akam.net95.100.173.64 2600:1480:d800::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a5-65.akam.net95.100.168.65 2600:1480:b000::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a9-66.akam.net184.85.248.66 2a02:26f0:117::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
ns1-01.azure-dns.com13.107.236.1 2603:1061:0:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US13.107.236.1 2603:1061:0:700::1
ns2-01.azure-dns.net150.171.21.1 2620:1ec:8ec:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns3-01.azure-dns.org204.14.183.1 2a01:111:4000:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns4-01.azure-dns.info208.84.5.1 2620:1ec:bda:700::1AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-

Checks

  • ✓ 10 nameservers #6
    Delegated to a1-115.akam.net, a16-66.akam.net, a18-67.akam.net, a28-64.akam.net, a5-65.akam.net, a9-66.akam.net, ns1-01.azure-dns.com, ns2-01.azure-dns.net, ns3-01.azure-dns.org, ns4-01.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 10 IPv4 /24s and 10 IPv6 /48s.
  • ✓ 3 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 addresses; AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US): 8 addresses.
  • ✓ 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

20 of 20 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-115.akam.net 193.108.91.115NOERROR, 4 ms, authoritativenoyes / yesrefused41824.10
a1-115.akam.net 2600:1401:2::73NOERROR, 4 ms, authoritativenoyes / yesrefused41824.11
a16-66.akam.net 23.211.132.66NOERROR, 3 ms, authoritativenoyes / yesrefused48878.31
a16-66.akam.net 2600:1406:1b::42NOERROR, 6 ms, authoritativenoyes / yesrefused48878.27
a18-67.akam.net 95.101.36.67NOERROR, 5 ms, authoritativenoyes / yesrefused48878.27
a18-67.akam.net 2600:1480:4800::43NOERROR, 5 ms, authoritativenoyes / yesrefused48878.29
a28-64.akam.net 95.100.173.64NOERROR, 6 ms, authoritativenoyes / yesrefused48878.33
a28-64.akam.net 2600:1480:d800::40NOERROR, 5 ms, authoritativenoyes / yesrefused48878.29
a5-65.akam.net 95.100.168.65NOERROR, 6 ms, authoritativenoyes / yesrefused41824.5
a5-65.akam.net 2600:1480:b000::41NOERROR, 6 ms, authoritativenoyes / yesrefused41824.8
a9-66.akam.net 184.85.248.66NOERROR, 7 ms, authoritativenoyes / yesrefused41824.4
a9-66.akam.net 2a02:26f0:117::42NOERROR, 6 ms, authoritativenoyes / yesrefused41824.5
ns1-01.azure-dns.com 13.107.236.1NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns1-01.azure-dns.com 2603:1061:0:700::1NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns2-01.azure-dns.net 150.171.21.1NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns2-01.azure-dns.net 2620:1ec:8ec:700::1NOERROR, 7 ms, authoritativenoyes / yesrefused-
ns3-01.azure-dns.org 204.14.183.1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3-01.azure-dns.org 2a01:111:4000:700::1NOERROR, 6 ms, authoritativenoyes / yesrefused-
ns4-01.azure-dns.info 208.84.5.1NOERROR, 4 ms, authoritativenoyes / yesrefusedKnot DNS 3.1.2.1770717641.d6b376aff
ns4-01.azure-dns.info 2620:1ec:bda:700::1NOERROR, 5 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 20 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: a1-115.akam.net: "41824.10"; a1-115.akam.net: "41824.11"; a16-66.akam.net: "48878.31"; a16-66.akam.net: "48878.27"; a18-67.akam.net: "48878.27"; a18-67.akam.net: "48878.29"; a28-64.akam.net: "48878.33"; a28-64.akam.net: "48878.29"; a5-65.akam.net: "41824.5"; a5-65.akam.net: "41824.8"; a9-66.akam.net: "41824.4"; a9-66.akam.net: "41824.5"; ns4-01.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 2019123704 · primary a1-115.akam.net

Found

Primary (MNAME)
a1-115.akam.net
Contact (RNAME)
hostmaster.yammer.com
Serial
2019123704
Refresh / retry
3600 s / 600 s
Expire
604800 s
Negative TTL
300 s

Serial per nameserver

NameserverSerial
a1-115.akam.net (193.108.91.115)2019123704
a1-115.akam.net (2600:1401:2::73)2019123704
a16-66.akam.net (23.211.132.66)2019123704
a16-66.akam.net (2600:1406:1b::42)2019123704
a18-67.akam.net (95.101.36.67)2019123704
a18-67.akam.net (2600:1480:4800::43)2019123704
a28-64.akam.net (95.100.173.64)2019123704
a28-64.akam.net (2600:1480:d800::40)2019123704
a5-65.akam.net (95.100.168.65)2019123704
a5-65.akam.net (2600:1480:b000::41)2019123704
a9-66.akam.net (184.85.248.66)2019123704
a9-66.akam.net (2a02:26f0:117::42)2019123704
ns1-01.azure-dns.com (13.107.236.1)626
ns1-01.azure-dns.com (2603:1061:0:700::1)626
ns2-01.azure-dns.net (150.171.21.1)626
ns2-01.azure-dns.net (2620:1ec:8ec:700::1)626
ns3-01.azure-dns.org (204.14.183.1)626
ns3-01.azure-dns.org (2a01:111:4000:700::1)626
ns4-01.azure-dns.info (208.84.5.1)626
ns4-01.azure-dns.info (2620:1ec:bda:700::1)626

Checks

  • !
    Serials differ
    The nameservers serve different versions of the zone: 2019123704 on a1-115.akam.net (193.108.91.115), a1-115.akam.net (2600:1401:2::73), a16-66.akam.net (23.211.132.66), a16-66.akam.net (2600:1406:1b::42), a18-67.akam.net (95.101.36.67), a18-67.akam.net (2600:1480:4800::43), a28-64.akam.net (95.100.173.64), a28-64.akam.net (2600:1480:d800::40), a5-65.akam.net (95.100.168.65), a5-65.akam.net (2600:1480:b000::41), a9-66.akam.net (184.85.248.66), a9-66.akam.net (2a02:26f0:117::42); 626 on ns1-01.azure-dns.com (13.107.236.1), ns1-01.azure-dns.com (2603:1061:0:700::1), ns2-01.azure-dns.net (150.171.21.1), ns2-01.azure-dns.net (2620:1ec:8ec:700::1), ns3-01.azure-dns.org (204.14.183.1), ns3-01.azure-dns.org (2a01:111:4000:700::1), ns4-01.azure-dns.info (208.84.5.1), ns4-01.azure-dns.info (2620:1ec:bda:700::1). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.
    #22
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-115.akam.net is one of the listed nameservers.
  • ✓ Contact hostmaster@yammer.com #25
    The SOA RNAME hostmaster.yammer.com means hostmaster@yammer.com.
  • ✓ Timestamp serial #26
    The serial 2019123704 is a Unix timestamp (2033-12-25 11:41 UTC).

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

pass

20 records at the apex

Found

Read from
193.108.91.115:53
TypeValueTTL
SOAa1-115.akam.net. hostmaster.yammer.com. 2019123704 3600 600 604800 30086400
NSa1-115.akam.net.86400
NSa9-66.akam.net.86400
NSa5-65.akam.net.86400
NSns3-01.azure-dns.org.86400
NSns4-01.azure-dns.info.86400
NSns1-01.azure-dns.com.86400
NSa28-64.akam.net.86400
NSa18-67.akam.net.86400
NSns2-01.azure-dns.net.86400
NSa16-66.akam.net.86400
A150.171.74.131800
A150.171.73.131800
MX10 yammer-com.mail.protection.outlook.com.1800
TXT"v=spf1 include:spf.protection.outlook.com include:mailiespf.yammer.com mx include:_spf-ssg-a.microsoft.com -all"3600
TXT"MS=ms97340800"3600
TXT"google-site-verification=-Q7HmtzaJ5ho3-_EWV5dsb9SvqduEwS5Sz-w4Ag3K0U"3600
CAA0 issue "microsoft.com"3600
CAA0 issue "digicert.com"3600
CAA0 contactemail "caarecordaware@microsoft.com"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, MX 30m, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: microsoft.com, digicert.com.