ResearchRouting table, RPKI, IRR & looking glass

AS4181 TDS TELECOM

AS4181 (TDS-AS) is registered to TDS TELECOM in US, through ARIN. It originates 87 prefixes in the global routing table.

83
IPv4 prefixes
4
IPv6 prefixes
1,809,152
IPv4 addresses
93%
RPKI valid
Registration

Who holds AS4181

Names from RIPE NCC’s daily list of every allocated AS number. The ASN lookup fetches the full WHOIS record live.

AS number
AS4181
Handle
TDS-AS
Organization
TDS TELECOM
Country
US
Registry
ARIN
ASPA
2 providers
WHOIS recordARIN
#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       4181
ASName:         TDS-AS
ASHandle:       AS4181
RegDate:        1994-12-16
Updated:        2019-07-03
Ref:            https://rdap.arin.net/registry/autnum/4181


OrgName:        TDS TELECOM
OrgId:          TDST-Z
Address:        525 Junction Rd.
City:           Madison
StateProv:      WI
PostalCode:     53717
Country:        US
RegDate:        2019-04-23
Updated:        2026-07-15
Ref:            https://rdap.arin.net/registry/entity/TDST-Z


OrgTechHandle: SERVI6-ARIN
OrgTechName:   Service Activation
OrgTechPhone:  +1-800-358-3648 
OrgTechEmail:  serviceactivation@tdstelecom.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SERVI6-ARIN

OrgAbuseHandle: ABUSE163-ARIN
OrgAbuseName:   abuse
OrgAbusePhone:  +1-800-358-3648 
OrgAbuseEmail:  abuse@tds.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ABUSE163-ARIN

OrgTechHandle: INO44-ARIN
OrgTechName:   IP Network Operations
OrgTechPhone:  +1-800-358-3648 
OrgTechEmail:  ispadmin@tdstelecom.com
OrgTechRef:    https://rdap.arin.net/registry/entity/INO44-ARIN

OrgTechHandle: INE14-ARIN
OrgTechName:   IP Network Engineering
OrgTechPhone:  +1-800-358-3648 
OrgTechEmail:  IPRequests@tdstelecom.com
OrgTechRef:    https://rdap.arin.net/registry/entity/INE14-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
Routing

What AS4181 announces

Prefixes originated by AS4181 in the RouteViews table (refreshed every four hours), each checked against the RPKI (every ten minutes) and the IRR (daily).

IPv4 prefixes
83
IPv6 prefixes
4
IPv4 addresses
1,809,152 (7,067 /24s)
RPKI valid
81 93%
RPKI invalid
0
RPKI not found
6
ROAs naming AS4181
85
With an IRR route object
87 100%
Prefixes

Announced prefixes

Each opens its own page: who announces it, the paths our collectors see, its ROAs and route objects.

IPv4 (83)
24.40.80.0/2024.49.96.0/2024.49.128.0/2024.49.160.0/2024.52.0.0/2124.52.8.0/2224.52.18.0/2324.52.20.0/2224.52.32.0/2224.54.128.0/2024.54.144.0/2224.54.148.0/2324.54.160.0/2224.54.164.0/2324.54.168.0/2224.54.180.0/2224.54.184.0/2124.56.160.0/2224.56.170.0/2324.56.176.0/2224.56.180.0/2324.56.188.0/2324.75.192.0/2124.224.64.0/1824.236.32.0/2124.236.52.0/2240.161.0.0/1650.21.192.0/2064.17.68.0/2264.17.72.0/2364.17.76.0/2264.17.80.0/2064.35.192.0/2064.50.224.0/1964.83.160.0/1966.173.0.0/1766.220.96.0/1966.222.0.0/1767.204.128.0/1867.217.8.0/2167.217.16.0/2368.71.160.0/1969.11.128.0/1769.21.0.0/1669.128.0.0/1472.0.160.0/1972.35.128.0/1974.211.0.0/1874.211.64.0/1975.100.0.0/1696.60.0.0/15129.189.0.0/16134.140.0.0/16134.215.0.0/16135.131.0.0/16135.134.0.0/15139.135.0.0/19146.174.0.0/17157.212.0.0/16159.94.0.0/16159.112.0.0/17167.237.0.0/16184.60.0.0/15192.154.94.0/24198.59.191.0/24204.15.56.0/21204.194.5.0/24204.246.0.0/20206.197.131.0/24206.206.144.0/24208.73.88.0/21208.100.128.0/18208.117.112.0/20209.169.196.0/23209.169.202.0/23209.169.204.0/22209.169.216.0/23209.169.220.0/22216.87.224.0/20216.165.128.0/18216.170.128.0/17216.228.160.0/19217.143.0.0/16
IPv6 (4)
2600:3400::/282602:81b:f0de::/482604:ad00::/322610:1f0::/32

RPKI valid   RPKI invalid   no ROA covers it

Neighbors

Who AS4181 is reached through

The AS just before AS4181 in the paths our looking glass collectors hold, for 60 of its prefixes. Usually a transit provider, sometimes a peer. The number is how many of those prefixes it was seen on.

AS6939 HURRICANE 60AS7029 WINDSTREAM 60AS1299 TWELVE99 59AS3257 GTT-BACKBONE 1
ASPA

Provider authorization

AS4181 publishes an ASPA naming these providers. Check a path.

AS1299 TWELVE99AS3257 GTT-BACKBONE
IRR

Routing registry objects

From the mirrored IRR databases (RADB, the five RIRs and more). Look it up live.

Sourceas-nameMaintained by
ARINTDS-ASMNT-TDST-Z
RADBTDS-ASMAINT-TDST

Route objects with origin AS4181: ARIN 119 · RADB 7 · LEVEL3 1 · RIPE 1

as-sets that list AS4181 (27)
AS-4648-PAIX-PEERAS-ANY2-RSAS-COMCAST-EDIAAS-DRIXAS-GTPEERSAS-HURRICANEV6AS-KRAMBUAS-LEVEL3-CUSTOMERS-NAAS-LEVEL3-ORIGINS-NAAS-LSW-NYIIX-PEERSAS-LUMEN-CUSTOMERS-ASNSAS-PSINETUS-MCAS-RCN-CE-PEERSAS-TDS-TRANSITAS-TEST-TDS-TRANSITAS-TEST1-TDS-TRANSITAS-TEST2-TDS-TRANSITAS-TMNET-PEERSAS-XO-PAS16559:AS-PEERSAS29169:AS-PEERS4AS29169:AS-PEERS6AS3303:AS-SWCMPEERSAS35985:AS-PEERSAS401268:AS-PEERSAS40382:AS-IXPEERSAS7575:AS-PEER
Tools

Check AS4181 live

ASN lookup and WHOISRPKI validatorASPA validatorIRR lookup