rcn.com

Checked 22 October 2026, 10:25 UTC · via 8.8.8.8
iAll checks passed
30 passed 0 warnings 0 failed 5 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-06-29

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
30 June 1997
Last changed
17 December 2024
Expires
29 June 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
auth1.dns.rcn.net, auth2.dns.rcn.net, auth3.dns.rcn.net, auth4.dns.rcn.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 2027-06-29 #3
    The registration is valid until 2027-06-29 (249 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

info

auth1.dns.rcn.net, auth2.dns.rcn.net, auth3.dns.rcn.net, auth4.dns.rcn.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
auth1.dns.rcn.net, auth2.dns.rcn.net, auth3.dns.rcn.net, auth4.dns.rcn.net
NS in the zone
auth1.dns.rcn.net, auth2.dns.rcn.net, auth3.dns.rcn.net, auth4.dns.rcn.net
NameserverAddressesNetwork (AS)Glue
auth1.dns.rcn.net207.172.3.20 66.44.1.44 2610:80:0:102::44 2610:80:0:10e::20AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US-
auth2.dns.rcn.net207.172.11.14 207.237.14.120 2610:80:0:100::17 2610:80:0:101::120AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US-
auth3.dns.rcn.net207.172.3.21 207.96.3.153 2610:80:0:10e::21 2610:80:80::153AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US-
auth4.dns.rcn.net207.172.3.22 24.155.96.100 208.59.89.9 2610:80:0:103::9 2610:80:0:10e::22AS6079 RCN-AS - RCN, US AS7459 GRANDECOM-AS1 - Grande Communications Networks, LLC, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US AS6079 RCN-AS - RCN, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to auth1.dns.rcn.net, auth2.dns.rcn.net, auth3.dns.rcn.net, auth4.dns.rcn.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 7 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS6079 (RCN-AS - RCN, US): 16 addresses; AS7459 (GRANDECOM-AS1 - Grande Communications Networks, LLC, US): 1 address.
  • 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

17 of 17 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
auth1.dns.rcn.net 207.172.3.20NOERROR, 101 ms, authoritativenoyes / yesrefusedRCN
auth1.dns.rcn.net 66.44.1.44NOERROR, 103 ms, authoritativenoyes / yesrefusedRCN
auth1.dns.rcn.net 2610:80:0:102::44NOERROR, 116 ms, authoritativenoyes / yesrefusedRCN
auth1.dns.rcn.net 2610:80:0:10e::20NOERROR, 116 ms, authoritativenoyes / yesrefusedRCN
auth2.dns.rcn.net 207.172.11.14NOERROR, 106 ms, authoritativenoyes / yesrefusedRCN
auth2.dns.rcn.net 207.237.14.120NOERROR, 92 ms, authoritativenoyes / yesrefusedRCN
auth2.dns.rcn.net 2610:80:0:100::17NOERROR, 117 ms, authoritativenoyes / yesrefusedRCN
auth2.dns.rcn.net 2610:80:0:101::120NOERROR, 109 ms, authoritativenoyes / yesrefusedRCN
auth3.dns.rcn.net 207.172.3.21NOERROR, 101 ms, authoritativenoyes / yesrefusedRCNN
auth3.dns.rcn.net 207.96.3.153NOERROR, 92 ms, authoritativenoyes / yesrefusedRCN01
auth3.dns.rcn.net 2610:80:0:10e::21NOERROR, 115 ms, authoritativenoyes / yesrefusedRCNN
auth3.dns.rcn.net 2610:80:80::153NOERROR, 114 ms, authoritativenoyes / yesrefusedRCN01
auth4.dns.rcn.net 207.172.3.22NOERROR, 103 ms, authoritativenoyes / yesrefusedRCN
auth4.dns.rcn.net 24.155.96.100NOERROR, 135 ms, authoritativenoyes / yesrefusedRCN
auth4.dns.rcn.net 208.59.89.9NOERROR, 113 ms, authoritativenoyes / yesrefusedRCN
auth4.dns.rcn.net 2610:80:0:103::9NOERROR, 133 ms, authoritativenoyes / yesrefusedRCN
auth4.dns.rcn.net 2610:80:0:10e::22NOERROR, 115 ms, authoritativenoyes / yesrefusedRCN

Checks

  • ✓ All respond #14
    All 17 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: auth1.dns.rcn.net: "RCN"; auth2.dns.rcn.net: "RCN"; auth3.dns.rcn.net: "RCNN"; auth3.dns.rcn.net: "RCN01"; auth4.dns.rcn.net: "RCN".
    #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

info

serial 2026102201 · primary master.dns.rcn.net

Found

Primary (MNAME)
master.dns.rcn.net
Contact (RNAME)
hostmaster.rcn.com
Serial
2026102201
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
auth1.dns.rcn.net (207.172.3.20)2026102201
auth1.dns.rcn.net (66.44.1.44)2026102201
auth1.dns.rcn.net (2610:80:0:102::44)2026102201
auth1.dns.rcn.net (2610:80:0:10e::20)2026102201
auth2.dns.rcn.net (207.172.11.14)2026102201
auth2.dns.rcn.net (207.237.14.120)2026102201
auth2.dns.rcn.net (2610:80:0:100::17)2026102201
auth2.dns.rcn.net (2610:80:0:101::120)2026102201
auth3.dns.rcn.net (207.172.3.21)2026102201
auth3.dns.rcn.net (207.96.3.153)2026102201
auth3.dns.rcn.net (2610:80:0:10e::21)2026102201
auth3.dns.rcn.net (2610:80:80::153)2026102201
auth4.dns.rcn.net (207.172.3.22)2026102201
auth4.dns.rcn.net (24.155.96.100)2026102201
auth4.dns.rcn.net (208.59.89.9)2026102201
auth4.dns.rcn.net (2610:80:0:103::9)2026102201
auth4.dns.rcn.net (2610:80:0:10e::22)2026102201

Checks

  • ✓ Serial 2026102201 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1d.
  • i
    Hidden master
    The primary nameserver master.dns.rcn.net is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact hostmaster@rcn.com #25
    The SOA RNAME hostmaster.rcn.com means hostmaster@rcn.com.
  • ✓ Date-based serial #26
    The serial 2026102201 follows the YYYYMMDDnn convention (2026-10-22).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
21 November 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
23381RSASHA256 (8)SHA256 DFE48DB7F8817A7D…yes
50155ECDSAP256SHA256 (13)SHA256 2964A18AE9CADEC2…yes

DNSKEY in the zone

Key tagRoleAlgorithm
50155KSK (257)ECDSAP256SHA256 (13)
23381KSK (257)RSASHA256 (8)
49618ZSK (256)RSASHA256 (8)
25674ZSK (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 23381 (SHA256), key tag 50155 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13), RSASHA256 (8).
  • ✓ Signatures valid until 2026-11-21 #30
    The earliest DNSKEY/SOA signature expires at 2026-11-21 04:04 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

pass

22 records at the apex

Found

Read from
207.172.3.20:53
TypeValueTTL
SOAmaster.dns.rcn.net. hostmaster.rcn.com. 2026102201 10800 3600 604800 8640086400
NSauth2.dns.rcn.net.86400
NSauth4.dns.rcn.net.86400
NSauth1.dns.rcn.net.86400
NSauth3.dns.rcn.net.86400
A74.85.65.246300
MX50 mx.rcn.com.86400
TXT"a47vvq69u0ml2cip614dah8g3s"300
TXT"google-site-verification=2uiUcN7YX0LW7iYMwpWdj1FUuGoJ9Pv1t1jP-B8piGY"300
TXT"google-site-verification=OLtZ9OjK5fEMBTQd_C03Wl0O3mdHmSG-hYLUnCBNTB0"300
TXT"v=spf1 include:_netblocks.eloqua.com ip4:207.172.4.0/24 ip4:207.172.157.0/24 ip4:208.58.56.0/24 ip4:198.183.9.0/24 ip4:146.115.106.224/27 " "ip4:207.172.159.1 ip4:66.235.59.86 ip4:130.250.132.170 ip4:130.250.130.230 a:mail.mutare.com a:mail.mutaresoftware.com include:_spf.rcn.syn-alias.com ~all"300
TXT"o5e4l8lmv08769car541ug8c9f"300
TXT"1jftpj1r0tkq2t6ej6otup9eh4"300
TXT"o5e4l8lmv08769car541ug8c9f."300
TXT"google-site-verification=s4gODhH2EzJBxw_6QGBPH-xFK6tEI9HIjBEZm4H2EVw"300
CAA0 issue "godaddy.com"86400
CAA0 issuewild "letsencrypt.org"86400
CAA0 issue "digicert.com"86400
CAA0 iodef "mailto:iodefcaa@rcn.com"86400
CAA0 issue "letsencrypt.org"86400
CAA0 issuewild "digicert.com"86400
CAA0 issuewild "godaddy.com"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 1d, 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: godaddy.com, letsencrypt.org, digicert.com.