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Network report

Who holds an IP address, prefix or AS number, how it is routed (origin AS, RPKI, IRR), its reverse DNS, blocklist listings and PeeringDB record, with what to fix first.

IP address, prefix or AS number

AS33661 · 

curl -s "https://thenetworkery.com/api/v1/network-report?query=AS33661"
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Warning: AS33661 (CMCS) announces 7 IPv4 and 15 IPv6 prefixes. 3 warnings

AS pageAS33661
HolderCMCS - Comcast Cable Communications, LLC
AllocationARIN, United States (US), assigned 2005-02-16
Prefixes (IPv4 / IPv6)7 / 15
RPKI valid100% (22 / 22)
Upstreams and peers1
Peering policyRestrictive

What to fix

  1. Warning

    6 of 22 announced prefixes have no IRR route object: 50.227.97.0/24, 50.226.0.0/24, 50.228.116.0/24, 50.236.155.0/24, 50.218.97.0/24 (+1).

    Many networks build their prefix filters from IRR data; without route objects some of them drop the routes.

    Fix: Create route (IPv4) and route6 (IPv6) objects with origin AS33661 in your RIR’s IRR database (or RADB).

    route: 50.227.97.0/24
origin: AS33661

route: 50.226.0.0/24
origin: AS33661

route: 50.228.116.0/24
origin: AS33661

    Open in ASN & BGP prefix lookup

  2. Warning

    No IRR as-set is listed.

    Peers and route servers build prefix filters from the as-set. Without one they fall back to the AS number alone, which breaks as soon as you have customers.

    Fix: Create an as-set in your RIR’s IRR database and add it to your PeeringDB record.

    Open in PeeringDB lookup

  3. Warning

    No public NOC, policy or technical contact.

    Other networks use these addresses to set up peering and to reach you during an incident.

    Fix: Add a role contact (for example noc@ or peering@ an address you monitor) with visibility Public.

    Open in PeeringDB lookup

Checks

Routing and RPKI 6 of 22 announced prefixes have no IRR route object: 50.227.97.0/24, 50.226.0.0/24, 50.228.116.0/24, 50.236.155.0/24, 50.218.97.0/24 (+1).
  • Pass: AS33661 announces 7 IPv4 and 15 IPv6 prefixes.
  • Pass: All 22 announced prefixes are RPKI valid.
  • Warning: 6 of 22 announced prefixes have no IRR route object: 50.227.97.0/24, 50.226.0.0/24, 50.228.116.0/24, 50.236.155.0/24, 50.218.97.0/24 (+1).
  • Info: One upstream or peer seen (AS7922): an outage there takes the whole network off the internet.
HolderCMCS - Comcast Cable Communications, LLC
IPv4 prefixes7
IPv6 prefixes15
RPKI22 valid
Without IRR route object6
Downstream networks23

Upstreams and peers seen to the left 1

AS7922 Comcast

Announced prefixes 22

50.218.97.0/24 50.220.33.0/24 50.226.0.0/24 50.227.97.0/24 50.228.116.0/24 50.236.155.0/24 50.237.76.0/24 2001:559:4ed::/48 2001:559:4ee::/48 2001:559:85d6::/48 2001:559:87d4::/48 2001:559:135::/48 2001:559:731::/48 2001:559:830d::/48 2001:559:864f::/48 2001:559:878c::/48 2001:559:8320::/48 2001:559:8462::/48 2001:559:c4b9::/48 2001:559:c4ea::/48 2001:559:c22b::/48 2001:559:c202::/48

Source: RIPEstat (RIPE NCC RIS, Routinator, IRR); AS names: Team Cymru

Open in ASN & BGP prefix lookup
Registration Found at rdap.arin.net.
  • Pass: Found at rdap.arin.net.
NameCMCS
HandleAS33661
RangeAS33661
Statusactive
Registered2005-02-16T14:59:31-05:00
Last changed2021-01-25T15:24:22-05:00
Abuse contactabuse@comcast.net
Allocation
Registry (RIR)ARIN
CountryUnited States (US)
Delegated on2005-02-16
StatusAssigned
Delegated rangeAS33661

Source: RIR delegation data, updated daily. The country is where the range was registered, not necessarily where it is used.

Contacts
RoleNameEmail
registrant Comcast Cable Communications, LLC

Source: https://rdap.arin.net/registry/autnum/33661. Registration data from rdap.arin.net, shown under its terms of use (terms): not for marketing or bulk collection.

Open in WHOIS / RDAP lookup
PeeringDB No IRR as-set is listed.
  • Pass: AS33661 is in PeeringDB as Comcast - West Florida.
  • Info: Peering policy: Restrictive.
  • Info: No internet exchange ports are listed.
  • Warning: No IRR as-set is listed.
  • Warning: No public NOC, policy or technical contact.
  • Info: The record was last updated 2022-07-27.
NetworkComcast - West Florida
AS numberAS33661
TypeCable/DSL/ISP, Regional
TrafficNot Disclosed
Peering policyRestrictive
Policy URLhttp://www.comcast.com/peering
LocationsNot Required
Ratio requiredYes
ContractsRequired
Last updated2022-07-27

Source: PeeringDB. Results are cached for an hour.

Open in PeeringDB lookup