sequoiacap.com

Checked 22 October 2026, 10:40 UTC · via 8.8.8.8
!Passed with warnings
23 passed 2 warnings 0 failed 6 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-04-29

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
28 April 1994
Last changed
28 March 2025
Expires
29 April 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.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 2027-04-29 #3
    The registration is valid until 2027-04-29 (188 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update 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

dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net
NS in the zone
dns1.c01.nsone.net.cn, dns1.p04.nsone.net, dns2.c01.nsone.net.cn, dns2.p04.nsone.net, dns3.c01.nsone.net.cn, dns3.p04.nsone.net, dns4.c01.nsone.net.cn, dns4.p04.nsone.net, dns5.c01.nsone.net.cn
NameserverAddressesNetwork (AS)Glue
dns1.c01.nsone.net.cn (zone only)47.94.104.101AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN-
dns1.p04.nsone.net198.51.44.4 2620:4d:4000:6259:7:4:0:1AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
dns2.c01.nsone.net.cn (zone only)106.14.209.108AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN-
dns2.p04.nsone.net198.51.45.4 2a00:edc0:6259:7:4::2AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
dns3.c01.nsone.net.cn (zone only)119.23.111.170AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN-
dns3.p04.nsone.net198.51.44.68 2620:4d:4000:6259:7:4:0:3AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
dns4.c01.nsone.net.cn (zone only)118.190.149.197AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN-
dns4.p04.nsone.net198.51.45.68 2a00:edc0:6259:7:4::4AS62597 NSONE - NSONE Inc, US AS62597 NSONE - NSONE Inc, US-
dns5.c01.nsone.net.cn (zone only)198.51.45.73AS62597 NSONE - NSONE Inc, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.p04.nsone.net, dns2.p04.nsone.net, dns3.p04.nsone.net, dns4.p04.nsone.net.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only in the zone: dns1.c01.nsone.net.cn, dns2.c01.nsone.net.cn, dns3.c01.nsone.net.cn, dns4.c01.nsone.net.cn, dns5.c01.nsone.net.cn. dns1.c01.nsone.net.cn, dns1.p04.nsone.net, dns2.c01.nsone.net.cn, dns2.p04.nsone.net, dns3.c01.nsone.net.cn, dns3.p04.nsone.net, dns4.c01.nsone.net.cn, dns4.p04.nsone.net, dns5.c01.nsone.net.cn report NS dns1.c01.nsone.net.cn dns1.p04.nsone.net dns2.c01.nsone.net.cn dns2.p04.nsone.net dns3.c01.nsone.net.cn dns3.p04.nsone.net dns4.c01.nsone.net.cn dns4.p04.nsone.net dns5.c01.nsone.net.cn.
    #7
  • ✓ 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 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS37963 (ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN): 4 addresses; AS62597 (NSONE - NSONE Inc, US): 9 addresses.
  • i
    All nameserver names under .net
    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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: dns1.c01.nsone.net.cn, dns2.c01.nsone.net.cn, dns3.c01.nsone.net.cn, dns4.c01.nsone.net.cn, dns5.c01.nsone.net.cn.
    #13

Nameservers

info

13 of 13 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.c01.nsone.net.cn 47.94.104.101NOERROR, 163 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns1.p04.nsone.net 198.51.44.4NOERROR, 5 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns1.p04.nsone.net 2620:4d:4000:6259:7:4:0:1NOERROR, 7 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns2.c01.nsone.net.cn 106.14.209.108NOERROR, 169 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns2.p04.nsone.net 198.51.45.4NOERROR, 5 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns2.p04.nsone.net 2a00:edc0:6259:7:4::2NOERROR, 5 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns3.c01.nsone.net.cn 119.23.111.170NOERROR, 209 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns3.p04.nsone.net 198.51.44.68NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns3.p04.nsone.net 2620:4d:4000:6259:7:4:0:3NOERROR, 7 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns4.c01.nsone.net.cn 118.190.149.197NOERROR, 202 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns4.p04.nsone.net 198.51.45.68NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns4.p04.nsone.net 2a00:edc0:6259:7:4::4NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9
dns5.c01.nsone.net.cn 198.51.45.73NOERROR, 4 ms, authoritativenoyes / yesrefused19dd46e347df36b70933bf2be8023258586586a9

Checks

  • ✓ All respond #14
    All 13 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: dns1.c01.nsone.net.cn: "19dd46e347df36b70933bf2be8023258586586a9"; dns1.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns2.c01.nsone.net.cn: "19dd46e347df36b70933bf2be8023258586586a9"; dns2.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns3.c01.nsone.net.cn: "19dd46e347df36b70933bf2be8023258586586a9"; dns3.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns4.c01.nsone.net.cn: "19dd46e347df36b70933bf2be8023258586586a9"; dns4.p04.nsone.net: "19dd46e347df36b70933bf2be8023258586586a9"; dns5.c01.nsone.net.cn: "19dd46e347df36b70933bf2be8023258586586a9".
    #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 1744839424 · primary dns1.p04.nsone.net

Found

Primary (MNAME)
dns1.p04.nsone.net
Contact (RNAME)
hostmaster.nsone.net
Serial
1744839424
Refresh / retry
3600 s / 600 s
Expire
604800 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
dns1.c01.nsone.net.cn (47.94.104.101)1744839424
dns1.p04.nsone.net (198.51.44.4)1744839424
dns1.p04.nsone.net (2620:4d:4000:6259:7:4:0:1)1744839424
dns2.c01.nsone.net.cn (106.14.209.108)1744839424
dns2.p04.nsone.net (198.51.45.4)1744839424
dns2.p04.nsone.net (2a00:edc0:6259:7:4::2)1744839424
dns3.c01.nsone.net.cn (119.23.111.170)1744839424
dns3.p04.nsone.net (198.51.44.68)1744839424
dns3.p04.nsone.net (2620:4d:4000:6259:7:4:0:3)1744839424
dns4.c01.nsone.net.cn (118.190.149.197)1744839424
dns4.p04.nsone.net (198.51.45.68)1744839424
dns4.p04.nsone.net (2a00:edc0:6259:7:4::4)1744839424
dns5.c01.nsone.net.cn (198.51.45.73)1744839424

Checks

  • ✓ Serial 1744839424 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 1h, retry 10m, expire 7d, negative TTL 10m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.p04.nsone.net is one of the listed nameservers.
  • ✓ Contact hostmaster@nsone.net #25
    The SOA RNAME hostmaster.nsone.net means hostmaster@nsone.net.
  • ✓ Timestamp serial #26
    The serial 1744839424 is a Unix timestamp (2025-04-16 21:37 UTC).

DNSSEC

info

Not signed

Found

Validated by resolver
no
Lookup error: read udp 46.225.38.91:47665->47.94.104.101:53: i/o timeout

Checks

  • i
    Could not be checked
    The DNSSEC lookup failed, so this could not be checked: read udp 46.225.38.91:47665->47.94.104.101:53: i/o timeout
    #27

Records

warn

53 records at the apex

Found

Read from
47.94.104.101:53
TypeValueTTL
SOAdns1.p04.nsone.net. hostmaster.nsone.net. 1744839424 3600 600 604800 6003600
NSdns1.p04.nsone.net.600
NSdns2.p04.nsone.net.600
NSdns3.p04.nsone.net.600
NSdns4.p04.nsone.net.600
NSdns1.c01.nsone.net.cn.600
NSdns2.c01.nsone.net.cn.600
NSdns3.c01.nsone.net.cn.600
NSdns4.c01.nsone.net.cn.600
NSdns5.c01.nsone.net.cn.600
A31.43.160.65
A31.43.161.65
MX30 us-smtp-inbound-1.mimecast.com.60
MX30 us-smtp-inbound-2.mimecast.com.60
TXT"F248C90BDE"600
TXT"MS=ms15563163"600
TXT"adobe-idp-site-verification=ca2a0171cc040f6c998f5a618d4bbf33e66431e686f0cd2ee3738229f332c828"600
TXT"apple-domain-verification=T17jEkIMe2UhgiGX"600
TXT"blitz=mu-80072269-9c3c87e9-3a9459ad-d42c036b"600
TXT"docusign=ab0dc078-2bbc-4a58-a819-fd0a907b0e34"600
TXT"globalsign-domain-verification=nyIblEmuSohD6vxXFKLwyUHnlX2RtbW_-m12stT8qN"600
TXT"google-site-verification=GZ7JN99gutudt14erKiGAzS0LftkYAGeS0Nd8aob1W4"600
TXT"google-site-verification=nkmfAkGxcceRSPwOoGJQQzT2gx5cHLIKKMBU2B2iw8c"600
TXT"google-site-verification=zqXJ_7yJb6aJJuonNpZMz73cm9DZnKX-Q6PFLDaxxBA"600
TXT"segment-site-verification=pptl3riS3qQ9a2EiwBPVrMPGToAgvZmg"600
TXT"v=spf1 include:_spf.sequoiacap_com._d.easydmarc.pro ~all"600
TXT"zNpqo1LF8NjyN3vSolKUNub2/hK3EYSnER3MFsvQLdhNa4Q6VffJk6xIKOB/Qms1UiIaORB4lW5T2p+I/MrHyg=="600
TXT"google-site-verification=C6tSBd01_kF9lFn2o-t93eu5SAGkDtrlf8LkRT2gzkA"600
TXT"site24x7-signals-domain-verification=f2b7caf2fbf569e129a9b2a37c39fc97"600
TXT"cloudhealth=aef2f462-cc09-4b32-aec4-97a9d6f1a056"600
TXT"atlassian-domain-verification=z1IaMItf6aBu3wILzul8/m3Q72gYCxRiUFPoBrh8rEHqXw5lExf/8sb2VkCTlRmF"600
TXT"zapier-domain-verification-challenge=49abda16-d1be-41a2-b296-44e37ea49c21"600
TXT"google-site-verification=7SUcLCiofLeYx6UhHEihspoenSJrIB9OAEOa6OF9Ic4"600
TXT"49vp2zj0cdd8j46t76tlsk2y1g3nkn6h"600
TXT"wiz-domain-verification=1a1ac0484629090b26239c8cdff8d682f0ae68bdbe7cc04f6a545b555e379ce0"600
TXT"docker-verification=1f89d9cc-b11d-4102-a45d-ede5507b899e"600
TXT"google-site-verification=LQuxYyhyPGfchx1TBUetvrmmMSzn308ZN3HKX1uFGdA"600
TXT"mgverify=7dc53cfc3305b4c7697138a65f7e5abccebd7ef986be0371da5d1716e0641fe2"600
TXT"linear-domain-verification=152277"600
TXT"notion-domain-verification=MOHUmRRwBbNaKjYnMtySmCZ0dewgNIQRi9GuHSYVV5Z"600
TXT"google-site-verification=tfKIGX9kjJhGNb3JqyRU_m0H8oysJS-FY17rTEn_uGg"600
TXT"apple-domain-verification=bcJMyEcs93RsODFl91GpIaXsVln8I450RJaPRiw1jgg"600
TXT"google-site-verification=xYdWxyOj2eRMhjD8N5mjfrSJcUrOC1FeMIxPSY_ZLEo\010"600
TXT"amazon-business-verification=0402be2ec93c9be3a3dcc702db01f73a156a04d9a3fb2fc0ebcc80b22f23641b"600
TXT"zoho-verification=zb95205285.zmverify.zoho.com"600
TXT"atlassian-sending-domain-verification=b8b0cd74-4bfa-454b-b16e-90092fdcaa45"600
TXT"byrzhbxzfptpck3m1dz534x7q38bq1cp"600
TXT"infoblox-domain-mastery=28ee4820d9ac9ad86aeaea796ce42f2186e92f7e46e12dad1ba8ce69351695f47f"600
TXT"openai-domain-verification=dv-wu1NtyUinBtXcXXo8MRjwh1l"600
TXT"jamf-site-verification=atjSP1WJd-NPbAiw5BT_iQ"600
TXT"cursor-domain-verification-j50z5t=x5MjBO87FWVPmMh073inTsdb0"600
TXT"anthropic-domain-verification-se2rd8=TOye4ypUYAfksubeTKHpYtyM8"600
TXT"serval-domain-verification-k1pa8y=oc79ZzgiQcuGNL6ncdM8D7ylh"600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (5s), MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 10m; 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