rsa.com

Checked 22 October 2026, 10:32 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · SafeNames Ltd. · expires 2028-06-07

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
SafeNames Ltd.
Registered
8 June 1990
Last changed
30 June 2026
Expires
7 June 2028
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns-1490.awsdns-58.org, ns-1958.awsdns-52.co.uk, ns-300.awsdns-37.com, ns-721.awsdns-26.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 2028-06-07 #3
    The registration is valid until 2028-06-07 (593 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

ns-1490.awsdns-58.org, ns-1958.awsdns-52.co.uk, ns-300.awsdns-37.com, ns-721.awsdns-26.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1490.awsdns-58.org, ns-1958.awsdns-52.co.uk, ns-300.awsdns-37.com, ns-721.awsdns-26.net
NS in the zone
ns-1490.awsdns-58.org, ns-1958.awsdns-52.co.uk, ns-300.awsdns-37.com, ns-721.awsdns-26.net
NameserverAddressesNetwork (AS)Glue
ns-1490.awsdns-58.org205.251.197.210 2600:9000:5305:d200::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1958.awsdns-52.co.uk205.251.199.166 2600:9000:5307:a600::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-300.awsdns-37.com205.251.193.44 2600:9000:5301:2c00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.193.44 2600:9000:5301:2c00::1
ns-721.awsdns-26.net205.251.194.209 2600:9000:5302:d100::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1490.awsdns-58.org, ns-1958.awsdns-52.co.uk, ns-300.awsdns-37.com, ns-721.awsdns-26.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-1490.awsdns-58.org 205.251.197.210NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1490.awsdns-58.org 2600:9000:5305:d200::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1958.awsdns-52.co.uk 205.251.199.166NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1958.awsdns-52.co.uk 2600:9000:5307:a600::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-300.awsdns-37.com 205.251.193.44NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-300.awsdns-37.com 2600:9000:5301:2c00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-721.awsdns-26.net 205.251.194.209NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-721.awsdns-26.net 2600:9000:5302:d100::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-1958.awsdns-52.co.uk

Found

Primary (MNAME)
ns-1958.awsdns-52.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-1490.awsdns-58.org (205.251.197.210)1
ns-1490.awsdns-58.org (2600:9000:5305:d200::1)1
ns-1958.awsdns-52.co.uk (205.251.199.166)1
ns-1958.awsdns-52.co.uk (2600:9000:5307:a600::1)1
ns-300.awsdns-37.com (205.251.193.44)1
ns-300.awsdns-37.com (2600:9000:5301:2c00::1)1
ns-721.awsdns-26.net (205.251.194.209)1
ns-721.awsdns-26.net (2600:9000:5302:d100::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-1958.awsdns-52.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

22 records at the apex

Found

Read from
205.251.197.210:53
TypeValueTTL
SOAns-1958.awsdns-52.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1490.awsdns-58.org.3600
NSns-1958.awsdns-52.co.uk.3600
NSns-300.awsdns-37.com.3600
NSns-721.awsdns-26.net.3600
A23.185.0.2530
AAAA2620:12a:8000::253300
AAAA2620:12a:8001::253300
MX0 rsa-com.mail.protection.outlook.com.300
TXT"1password-site-verification=4V27C6JPIFFVBDDIEE5YIL77E4"60
TXT"MS=ms90489311"60
TXT"\"pardot797543=a121c07948bd4cf50df49891c71a0c1739de73528fb36098aa383915e9612587\"infoblox-domain-mastery=765fce554d7dd73675a4a9779d1967e15493a136eb36b478abb5d6416c510cbf49" "atlassian-domain-verification=sVvcbIYiJrbfN7cZkqNf3OaQnLyngvusnwaWrdovYqZ10Df6k7uPwBh8/p2k3jYy"60
TXT"_7hjf63kmy6pbru7v8jjiqoy7a430tah"60
TXT"_df2hgo7cd4oudkx9bbfa2qy1t9rlq15" "rippling-domain-verification=5b787c07e74fd8e0"60
TXT"_s3m1kf9fvan174wb8w6hke1jjgaf1m1"60
TXT"anthropic-domain-verification-7rr5mx=HLk2MbJacVDlBPqpYHzvsaSuD"60
TXT"apple-domain-verification=yP11UNe61qw3NR4D"60
TXT"google-site-verification=RcV5uS-zNVJ4FsQ1jWG6OBM-W3zN5vSLy13cJ-vlbyM"60
TXT"jamf-site-verification=femhbQuhI8v06Vx-wMpbHw"60
TXT"openai-domain-verification=dv-TO9IiQcyXC7Qf0vpJKCT3vuk"60
TXT"securid-domain-verification=l2Qml9lN60428i0"60
TXT"v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"60

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (0s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1h; 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