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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

AS31477 · 

curl -s "https://thenetworkery.com/api/v1/network-report?query=AS31477"
JSON Docs

Warning: AS31477 (DUOCAST-AS Duocast B.V.) announces 43 IPv4 and 12 IPv6 prefixes. 2 warnings

AS pageAS31477
HolderDUOCAST-AS Duocast B.V.
AllocationRIPE NCC, Netherlands (NL), allocated 2004-05-26
Prefixes (IPv4 / IPv6)43 / 12
RPKI valid69% (38 / 55)
Upstreams and peers68
Peering policyOpen

What to fix

  1. Warning

    10 of 55 announced prefixes have no ROA (RPKI not found): 37.9.160.0/21, 91.196.106.0/24, 91.209.192.0/24, 91.213.95.0/24, 91.220.82.0/24 (+5).

    Without a ROA, networks cannot tell your routes from a hijack.

    Fix: Create a ROA for each at your RIR portal, with origin AS31477 and a max length equal to the prefix length:

    37.9.160.0/21 AS31477 max-length /21
91.196.106.0/24 AS31477 max-length /24
91.209.192.0/24 AS31477 max-length /24
91.213.95.0/24 AS31477 max-length /24
91.220.82.0/24 AS31477 max-length /24
93.184.96.0/20 AS31477 max-length /20
185.134.65.0/24 AS31477 max-length /24
193.9.23.0/24 AS31477 max-length /24
193.177.163.0/24 AS31477 max-length /24
193.200.178.0/24 AS31477 max-length /24

    Open in RPKI / ROA validator Guide

  2. Warning

    5 of 55 announced prefixes have no IRR route object: 2a07:3505:81::/48, 194.13.8.0/24, 87.238.171.0/24, 193.138.248.0/24, 193.138.250.0/24.

    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 AS31477 in your RIR’s IRR database (or RADB).

    route6: 2a07:3505:81::/48
origin: AS31477

route: 194.13.8.0/24
origin: AS31477

route: 87.238.171.0/24
origin: AS31477

    Open in ASN & BGP prefix lookup

Checks

Routing and RPKI 10 of 55 announced prefixes have no ROA (RPKI not found): 37.9.160.0/21, 91.196.106.0/24, 91.209.192.0/24, 91.213.95.0/24, 91.220.82.0/24 (+5).
  • Pass: AS31477 announces 43 IPv4 and 12 IPv6 prefixes.
  • Warning: 10 of 55 announced prefixes have no ROA (RPKI not found): 37.9.160.0/21, 91.196.106.0/24, 91.209.192.0/24, 91.213.95.0/24, 91.220.82.0/24 (+5).
  • Info: 38 of 55 announced prefixes are RPKI valid.
  • Info: The RPKI state of 7 prefixes was not looked up (no ROA of AS31477 covers them; only the first 10 are checked).
  • Warning: 5 of 55 announced prefixes have no IRR route object: 2a07:3505:81::/48, 194.13.8.0/24, 87.238.171.0/24, 193.138.248.0/24, 193.138.250.0/24.
  • Info: 68 upstreams and peers, 13 downstream networks seen.
HolderDUOCAST-AS Duocast B.V.
IPv4 prefixes43
IPv6 prefixes12
RPKI38 valid · 10 not found · 7 not looked up
Without IRR route object5
Downstream networks13
Routes to fix
PrefixRPKI
37.9.160.0/21 No ROA
91.196.106.0/24 No ROA
91.209.192.0/24 No ROA
91.213.95.0/24 No ROA
91.220.82.0/24 No ROA
93.184.96.0/20 No ROA
185.134.65.0/24 No ROA
193.9.23.0/24 No ROA
193.177.163.0/24 No ROA
193.200.178.0/24 No ROA

Upstreams and peers seen to the left 68

AS1299 Arelion (Twelve99) AS2914 NTT Global IP Network AS50673 Serverius AS6830 Liberty Global AS6939 Hurricane Electric AS13030 Init7 AS33891 Core-Backbone AS4637 Telstra (International) AS37468 Angola Cables AS25091 IP-Max SA AS20485 TransTelecom AS34019 Hivane

Announced prefixes 55

37.9.160.0/21 45.82.188.0/22 82.150.139.0/24 83.137.144.0/21 83.137.146.0/24 83.137.151.0/24 87.238.168.0/21 87.238.171.0/24 89.188.0.0/19 89.188.0.0/20 89.188.0.0/21 89.188.8.0/21 89.200.200.0/21 89.200.200.0/24 91.196.104.0/24 91.196.105.0/24 91.196.106.0/24 91.196.107.0/24 91.198.178.0/24 91.206.136.0/23 91.209.192.0/24 91.213.95.0/24 91.220.82.0/24 93.184.96.0/20 185.80.245.0/24 185.80.246.0/24 185.134.65.0/24 185.180.96.0/22 185.180.96.0/24 193.9.23.0/24 193.138.248.0/22 193.138.248.0/24 193.138.250.0/24 193.164.144.0/24 193.177.163.0/24 193.200.178.0/24 193.202.109.0/24 194.13.8.0/22 194.13.8.0/24 194.13.12.0/23 194.13.14.0/24 195.137.165.0/24 195.137.169.0/24 2a0b:6d80::/29 2a0e:7280::/29 2a00:70c0::/48 2a01:1b0::/32 2a01:1b2::/32 2a07:3501:1020::/48 2a07:3505:80::/44 2a07:3505:81::/48 2001:67c:6b8::/48 2001:678:2b4::/48 2001:678:750::/48 2001:678:d0c::/48

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

Open in ASN & BGP prefix lookup
Registration Found at rdap.db.ripe.net.
  • Pass: Found at rdap.db.ripe.net.
NameDUOCAST-AS
HandleAS31477
RangeAS31477
Statusactive
Registered2004-05-26T11:33:27Z
Last changed2026-09-25T10:23:19Z
Abuse contactabuse@duocast.nl
Allocation
Registry (RIR)RIPE NCC
CountryNetherlands (NL)
Delegated on2004-05-26
StatusAllocated
Delegated rangeAS31477

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

Contacts
RoleNameEmail
registrant MNT-DUOCAST
registrant Duocast B.V.
registrant RIPE-NCC-END-MNT
abuse Duocast role abuse@duocast.nl

Source: https://rdap.db.ripe.net/autnum/31477. Registration data from rdap.db.ripe.net, shown under its terms of use (terms): not for marketing or bulk collection. Personal contacts in this registry are not shown.

Open in WHOIS / RDAP lookup
PeeringDB AS31477 is in PeeringDB as Duocast.
  • Pass: AS31477 is in PeeringDB as Duocast.
  • Info: Peering policy: Open.
  • Info: Present at 4 internet exchanges with 4 ports (140G in total).
NetworkDuocast
AS numberAS31477
TypeContent, Europe
Websitehttps://www.duocast.nl
IRR as-setRIPE::AS31477:AS-DUOCAST
Prefixes (IPv4 / IPv6)100 / 25
Traffic10-20Gbps, Balanced
Peering policyOpen
LocationsNot Required
Ratio requiredNo
ContractsNot Required
Last updated2026-09-18
Contacts
Abuseabuse@duocast.net
NOCnoc@duocast.net

Source: PeeringDB. Results are cached for an hour.

Open in PeeringDB lookup