237 MERIT-AS-14, US
Adjacency: 37 Upstream: 9 Downstream: 28
Upstream Adjacent AS list
AS293 ESNET, US
AS11164 INTERNET2-I2PX, US
AS3303 SWISSCOM Swisscom Switzerland Ltd, CH
AS174 COGENT-174, US
AS1299 TWELVE99 Arelion, fka Telia Carrier, SE
AS2914 NTT-LTD-2914, US
AS6939 HURRICANE, US
AS7018 ATT-INTERNET4, US
AS11537 INTERNET2-RESEARCH-EDU, US
Downstream Adjacent AS list
AS36375 UMICH-AS-5, US
AS11494 KELLOGGCC, US
AS11206 FSU-AS-1, US
AS1432 AC-AS-1, US
AS1638 MCC-CAMP, US
AS22251 REMC, US
AS229 MERIT-AS-6, US
AS22217 CALVIN-UNIVERSITY, US
AS19106 ANDREWS, US
AS15099 MONROE-COUNTY-MI-PUBLIC-ASN, US
AS25609 DMC, US
AS30154 DAVEN, US
AS3730 AQUINA-001, US
AS393817 LMC-BH, US
AS393665 BAKERS, US
AS32285 HFCC, US
AS27274 CMICH, US
AS231 MISU-231, US
AS396470 LCC-EDU, US
AS40044 BRONSON-HEALTHCARE-GROUP-INC, US
AS400238 PIEG-01, US
AS46241 WASHTENAW-ISD-ASN, US
AS53263 GRCC-AS1, US
AS46825 CBPU, US
AS400927 BARGER-CREEK, US
AS62618 MICHIGANTECH, US
AS62676 UMD-PUBLIC-AS, US
AS394769 UMF-7-AS, US
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 230 AS237 ORG+TRN Originate: 2359808 /10.83 Transit: 1323264 /11.66 MERIT-AS-14, US
Aggregation Suggestions
Filter: Aggregates, Specifics
This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.
Rank AS AS Name Current Wthdw Aggte Annce Redctn % 1997 AS237 MERIT-AS-14, US 83 36 7 54 29 34.94% Prefix AS Path Aggregation Suggestion 23.135.208.0/24 293 237 35.16.0.0/16 293 237 35.24.0.0/15 293 237 + Announce - aggregate of 35.24.0.0/16 (293 237) and 35.25.0.0/16 (293 237) 35.24.0.0/17 293 237 - Withdrawn - aggregated with 35.24.128.0/17 (293 237) 35.24.128.0/18 293 237 - Withdrawn - aggregated with 35.24.192.0/18 (293 237) 35.24.192.0/19 293 237 - Withdrawn - aggregated with 35.24.224.0/19 (293 237) 35.24.224.0/19 293 237 - Withdrawn - aggregated with 35.24.192.0/19 (293 237) 35.25.0.0/16 293 237 - Withdrawn - aggregated with 35.24.0.0/16 (293 237) 35.33.0.0/18 6939 237 35.33.5.0/24 293 237 35.33.6.0/24 293 237 35.33.96.0/19 6939 237 35.34.0.0/18 293 237 35.37.0.0/16 293 237 35.38.0.0/16 293 237 35.39.0.0/18 293 237 + Announce - aggregate of 35.39.0.0/19 (293 237) and 35.39.32.0/19 (293 237) 35.39.0.0/19 293 237 - Withdrawn - aggregated with 35.39.32.0/19 (293 237) 35.39.32.0/19 293 237 - Withdrawn - aggregated with 35.39.0.0/19 (293 237) 35.39.64.0/19 293 237 35.39.128.0/17 293 237 + Announce - aggregate of 35.39.128.0/18 (293 237) and 35.39.192.0/18 (293 237) 35.39.128.0/19 293 237 - Withdrawn - aggregated with 35.39.160.0/19 (293 237) 35.39.160.0/19 293 237 - Withdrawn - aggregated with 35.39.128.0/19 (293 237) 35.39.192.0/19 293 237 - Withdrawn - aggregated with 35.39.224.0/19 (293 237) 35.39.224.0/19 293 237 - Withdrawn - aggregated with 35.39.192.0/19 (293 237) 35.40.0.0/16 293 237 35.46.0.0/17 293 237 + Announce - aggregate of 35.46.0.0/18 (293 237) and 35.46.64.0/18 (293 237) 35.46.0.0/18 293 237 - Withdrawn - aggregated with 35.46.64.0/18 (293 237) 35.46.64.0/18 293 237 - Withdrawn - aggregated with 35.46.0.0/18 (293 237) 35.50.0.0/17 11537 237 35.50.0.0/18 11537 237 - Withdrawn - matching aggregate 35.50.0.0/17 11537 237 35.50.64.0/18 11537 237 - Withdrawn - matching aggregate 35.50.0.0/17 11537 237 35.58.0.0/16 293 237 35.62.0.0/15 293 237 + Announce - aggregate of 35.62.0.0/16 (293 237) and 35.63.0.0/16 (293 237) 35.62.0.0/16 293 237 - Withdrawn - aggregated with 35.63.0.0/16 (293 237) 35.63.0.0/16 293 237 - Withdrawn - aggregated with 35.62.0.0/16 (293 237) 35.64.0.0/14 293 237 35.68.0.0/15 293 237 35.70.0.0/16 293 237 35.71.0.0/18 293 237 74.115.236.0/23 6939 237 74.115.236.0/23 2914 237 + Announce - aggregate of 74.115.236.0/24 (2914 237) and 74.115.237.0/24 (2914 237) 74.115.236.0/24 2914 237 - Withdrawn - aggregated with 74.115.237.0/24 (2914 237) 74.115.237.0/24 2914 237 - Withdrawn - aggregated with 74.115.236.0/24 (2914 237) 141.210.0.0/16 293 237 141.210.0.0/17 293 237 - Withdrawn - matching aggregate 141.210.0.0/16 293 237 141.210.32.0/19 11537 237 141.210.128.0/17 293 237 - Withdrawn - matching aggregate 141.210.0.0/16 293 237 141.210.224.0/19 11537 237 141.217.0.0/16 6939 237 141.218.0.0/16 293 237 141.218.11.0/24 293 237 - Withdrawn - matching aggregate 141.218.0.0/16 293 237 141.218.203.0/24 293 237 - Withdrawn - matching aggregate 141.218.0.0/16 293 237 141.218.204.0/22 293 237 - Withdrawn - matching aggregate 141.218.0.0/16 293 237 141.218.208.0/20 293 237 - Withdrawn - matching aggregate 141.218.0.0/16 293 237 141.218.224.0/22 293 237 - Withdrawn - matching aggregate 141.218.0.0/16 293 237 141.218.228.0/23 293 237 - Withdrawn - matching aggregate 141.218.0.0/16 293 237 148.61.0.0/16 293 237 161.133.0.0/16 293 237 + Announce - aggregate of 161.133.0.0/17 (293 237) and 161.133.128.0/17 (293 237) 161.133.0.0/17 293 237 - Withdrawn - aggregated with 161.133.128.0/17 (293 237) 161.133.2.0/24 293 237 - Withdrawn - matching aggregate 161.133.0.0/17 293 237 161.133.104.0/21 293 237 - Withdrawn - matching aggregate 161.133.0.0/17 293 237 161.133.112.0/21 293 237 - Withdrawn - matching aggregate 161.133.0.0/17 293 237 161.133.120.0/21 293 237 - Withdrawn - matching aggregate 161.133.0.0/17 293 237 161.133.128.0/17 293 237 - Withdrawn - aggregated with 161.133.0.0/17 (293 237) 161.133.129.0/24 293 237 - Withdrawn - matching aggregate 161.133.128.0/17 293 237 163.253.36.0/22 293 237 164.76.0.0/16 11537 237 164.76.160.0/19 11537 237 - Withdrawn - matching aggregate 164.76.0.0/16 11537 237 192.35.170.0/24 293 237 192.41.229.0/24 293 237 192.41.232.0/22 293 237 192.88.242.0/24 293 237 192.122.182.0/23 293 237 192.122.184.0/21 293 237 192.122.200.0/24 293 237 192.138.137.0/24 6939 237 192.160.192.0/24 6939 237 192.160.204.0/24 6939 237 192.188.100.0/24 293 237 192.203.195.0/24 293 237 192.245.252.0/24 6939 237 192.245.254.0/24 6939 237 198.17.130.0/23 293 237 198.17.132.0/23 293 237 198.108.0.0/14 293 237 204.38.0.0/16 293 237 204.39.195.0/24 6939 237 206.201.157.0/24 6939 237 207.72.0.0/14 293 237 207.75.164.0/23 293 237 - Withdrawn - matching aggregate 207.72.0.0/14 293 237
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS237 27 More Specifics 66 Total Advertisements MERIT-AS-14, US
35.7.112.0/20 35.0.0.0/12
35.33.96.0/19 35.33.0.0/17
35.38.192.0/18 35.38.0.0/16
35.39.0.0/19 35.39.0.0/18
35.39.32.0/19 35.39.0.0/18
35.39.128.0/19 35.39.128.0/17
35.39.160.0/19 35.39.128.0/17
35.39.192.0/19 35.39.128.0/17
35.39.224.0/19 35.39.128.0/17
35.64.0.0/15 35.64.0.0/14
35.66.0.0/15 35.64.0.0/14
35.68.0.0/16 35.68.0.0/15
35.69.0.0/16 35.68.0.0/15
35.70.0.0/17 35.70.0.0/16
35.70.128.0/17 35.70.0.0/16
35.71.0.0/19 35.71.0.0/18
35.71.32.0/19 35.71.0.0/18
74.115.236.0/23 74.115.236.0/22
163.253.36.0/22 163.253.0.0/16
192.41.234.0/23 192.41.232.0/22
192.122.184.0/24 192.122.184.0/21
192.122.190.0/24 192.122.184.0/21
198.111.188.0/24 198.108.0.0/14
204.25.200.0/21 204.25.192.0/18
204.106.28.0/24 204.106.24.0/21
204.106.31.0/24 204.106.24.0/21
206.201.157.0/24 206.201.144.0/20
35.24.0.0/17 35.24.0.0/15
35.24.128.0/18 35.24.0.0/15
35.24.192.0/19 35.24.0.0/15
35.24.224.0/19 35.24.0.0/15
35.25.0.0/16 35.24.0.0/15
35.33.0.0/18 35.33.0.0/17
35.33.5.0/24 35.33.0.0/17
35.33.6.0/24 35.33.0.0/17
35.46.0.0/18 35.46.0.0/16
35.46.64.0/18 35.46.0.0/16
35.50.0.0/18 35.50.0.0/17
35.50.64.0/18 35.50.0.0/17
35.58.0.0/16 35.58.0.0/15
35.62.0.0/16 35.62.0.0/15
35.63.0.0/16 35.62.0.0/15
74.115.236.0/24 74.115.236.0/22
74.115.237.0/24 74.115.236.0/22
141.210.0.0/17 141.210.0.0/16
141.210.32.0/19 141.210.0.0/16
141.210.128.0/17 141.210.0.0/16
141.210.224.0/19 141.210.0.0/16
141.218.11.0/24 141.218.0.0/16
141.218.203.0/24 141.218.0.0/16
141.218.204.0/22 141.218.0.0/16
141.218.208.0/20 141.218.0.0/16
141.218.224.0/22 141.218.0.0/16
141.218.228.0/23 141.218.0.0/16
161.133.0.0/17 161.133.0.0/16
161.133.2.0/24 161.133.0.0/16
161.133.104.0/21 161.133.0.0/16
161.133.112.0/21 161.133.0.0/16
161.133.120.0/21 161.133.0.0/16
161.133.128.0/17 161.133.0.0/16
161.133.129.0/24 161.133.0.0/16
192.35.169.0/24 192.35.168.0/23
198.110.192.0/20 198.108.0.0/14
204.38.16.0/21 204.38.0.0/16
204.38.56.0/21 204.38.0.0/16
204.38.192.0/20 204.38.0.0/16
204.38.208.0/21 204.38.0.0/16
204.106.30.0/24 204.106.24.0/21
Prefixes added and withdrawn by this origin AS in the past 7 days.
+ 35.64.0.0/15 Announced
+ 35.66.0.0/15 Announced
+ 35.68.0.0/16 Announced
+ 35.69.0.0/16 Announced
+ 35.70.0.0/17 Announced
+ 35.70.128.0/17 Announced
+ 35.71.0.0/19 Announced
+ 35.71.32.0/19 Announced
+ 66.219.112.0/20 Announced
+ 192.41.234.0/23 Announced
+ 192.122.190.0/24 Announced
+ 198.111.188.0/24 Announced
+ 204.25.200.0/21 Announced
+ 208.68.24.0/22 Announced
- 35.24.0.0/17 Withdrawn
- 35.24.128.0/18 Withdrawn
- 35.24.192.0/19 Withdrawn
- 35.24.224.0/19 Withdrawn
- 35.25.0.0/16 Withdrawn
- 35.33.0.0/18 Withdrawn
- 35.33.5.0/24 Withdrawn
- 35.33.6.0/24 Withdrawn
- 35.34.0.0/18 Withdrawn
- 35.37.0.0/16 Withdrawn
- 35.38.0.0/16 Withdrawn
- 35.46.0.0/18 Withdrawn
- 35.46.64.0/18 Withdrawn
- 35.50.0.0/18 Withdrawn
- 35.50.64.0/18 Withdrawn
- 35.58.0.0/16 Withdrawn
- 35.62.0.0/16 Withdrawn
- 35.63.0.0/16 Withdrawn
- 74.115.236.0/24 Withdrawn
- 74.115.237.0/24 Withdrawn
- 141.210.0.0/17 Withdrawn
- 141.210.32.0/19 Withdrawn
- 141.210.128.0/17 Withdrawn
- 141.210.224.0/19 Withdrawn
- 141.218.11.0/24 Withdrawn
- 141.218.203.0/24 Withdrawn
- 141.218.204.0/22 Withdrawn
- 141.218.208.0/20 Withdrawn
- 141.218.224.0/22 Withdrawn
- 141.218.228.0/23 Withdrawn
- 161.133.0.0/17 Withdrawn
- 161.133.2.0/24 Withdrawn
- 161.133.104.0/21 Withdrawn
- 161.133.112.0/21 Withdrawn
- 161.133.120.0/21 Withdrawn
- 161.133.128.0/17 Withdrawn
- 161.133.129.0/24 Withdrawn
- 192.35.164.0/22 Withdrawn
- 192.35.169.0/24 Withdrawn
- 198.110.192.0/20 Withdrawn
- 204.38.0.0/16 Withdrawn
- 204.38.16.0/21 Withdrawn
- 204.38.56.0/21 Withdrawn
- 204.38.192.0/20 Withdrawn
- 204.38.208.0/21 Withdrawn
- 204.106.30.0/24 Withdrawn
whois: 402603
IANA has recorded AS237 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS237\n
#
# 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: 237
ASName: MERIT-AS-14
ASHandle: AS237
RegDate: 1988-09-12
Updated: 2012-04-02
Ref: https://rdap.arin.net/registry/autnum/237
OrgName: Merit Network Inc.
OrgId: MICH-Z
Address: 880 Technology Dr., Suite B
City: Ann Arbor
StateProv: MI
PostalCode: 48108
Country: US
RegDate: 2009-12-08
Updated: 2020-04-21
Ref: https://rdap.arin.net/registry/entity/MICH-Z
OrgTechHandle: MERIT-ARIN
OrgTechName: Merit Operations
OrgTechPhone: +1-734-527-5717
OrgTechEmail: operations@merit.edu
OrgTechRef: https://rdap.arin.net/registry/entity/MERIT-ARIN
OrgAbuseHandle: NETWO26-ARIN
OrgAbuseName: Network Abuse
OrgAbusePhone: +1-734-527-5740
OrgAbuseEmail: abuse@merit.edu
OrgAbuseRef: https://rdap.arin.net/registry/entity/NETWO26-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.
#