AS Report

Report for 21872

Name

WILLIS TOWERS WATSON - Willis Towers Watson, US

AS Adjacency Report

21872 TOWERS-PERRIN - Towers Perrin

  Adjacency:     2  Upstream:     2  Downstream:     0
  Upstream Adjacent AS list
    AS7018    ATT-INTERNET4 - AT&T WorldNet Services
    AS701     UUNET - MCI Communications Services, Inc. d/b/a Verizon Business

Announced Prefixes

Rank  AS       Type    Originate Addr Space  (pfx)   Transit Addr space  (pfx)  Description
13579 AS21872  ORIGIN  Originate:       1536 /21.42  Transit:          0 /0.00  TOWERS-PERRIN - Towers Perrin

Aggregation Suggestions

Filter: Aggregates, Specifics

 Rank AS            AS Name                                      Current  Wthdw  Aggte  Annce Redctn       %
 5462 AS21872 TOWERS-PERRIN - Towers Perrin                 3      2      1      2      1  33.33%


  Prefix               AS Path                              Aggregation Suggestion
  12.47.220.0/22       4637 3491 701 21872    
  12.159.92.0/23       4637 3491 3561 7018 21872 + Announce - aggregate of 12.159.92.0/24 (4637 3491 3561 7018 21872) and 12.159.93.0/24 (4637 3491 3561 7018 21872)
  12.159.92.0/24       4637 3491 3561 7018 21872 - Withdrawn - aggregated with 12.159.93.0/24 (4637 3491 3561 7018 21872)
  12.159.93.0/24       4637 3491 3561 7018 21872 - Withdrawn - aggregated with 12.159.92.0/24 (4637 3491 3561 7018 21872)

Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.

AS21872   6 More Specifics   6 Total Advertisements   TOWERS-PERRIN - Towers Perrin
    12.47.220.0/22                12.0.0.0/8
    12.47.220.0/24                12.0.0.0/8
    12.47.221.0/24                12.0.0.0/8
    12.47.222.0/24                12.0.0.0/8
    12.159.92.0/24                12.0.0.0/8
    12.159.93.0/24                12.0.0.0/8

Whois Entry

whois: 402603

IANA has recorded AS21872 as originally allocated by 
/usr/bin/whois -h jwhois.apnic.netr "AS21872\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:       21872
             ASName:         WILLIS TOWERS WATSON
             ASHandle:       AS21872
             RegDate:        2001-07-03
             Updated:        2022-02-04
             Ref:            https://rdap.arin.net/registry/autnum/21872
             
             
             OrgName:        Willis Towers Watson
             OrgId:          WTWUL
             Address:        800 N Glebe Rd
             Address:        9th Floor
             City:           Arlington
             StateProv:      VA
             PostalCode:     22207
             Country:        US
             RegDate:        2020-05-28
             Updated:        2025-10-31
             Ref:            https://rdap.arin.net/registry/entity/WTWUL
             
             
             OrgTechHandle: MOYLE21-ARIN
             OrgTechName:   Moyle, Mike 
             OrgTechPhone:  +1-215-246-6162 
             OrgTechEmail:  mike.moyle@wtwco.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/MOYLE21-ARIN
             
             OrgAbuseHandle: NSO34-ARIN
             OrgAbuseName:   Network Service Owner
             OrgAbusePhone:  +07585906307 
             OrgAbuseEmail:  mike.moyle@wtwco.com
             OrgAbuseRef:    https://rdap.arin.net/registry/entity/NSO34-ARIN
             
             OrgTechHandle: BAIGR-ARIN
             OrgTechName:   Baigrie, John 
             OrgTechPhone:  +441473223000 
             OrgTechEmail:  john.baigrie@wtwco.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/BAIGR-ARIN
             
             OrgDNSHandle: NSO34-ARIN
             OrgDNSName:   Network Service Owner
             OrgDNSPhone:  +07585906307 
             OrgDNSEmail:  mike.moyle@wtwco.com
             OrgDNSRef:    https://rdap.arin.net/registry/entity/NSO34-ARIN
             
             OrgTechHandle: CUNNI342-ARIN
             OrgTechName:   Cunningham, Neil 
             OrgTechPhone:  +441473223000 
             OrgTechEmail:  neil.cunningham@wtwco.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/CUNNI342-ARIN
             
             OrgRoutingHandle: NSO34-ARIN
             OrgRoutingName:   Network Service Owner
             OrgRoutingPhone:  +07585906307 
             OrgRoutingEmail:  mike.moyle@wtwco.com
             OrgRoutingRef:    https://rdap.arin.net/registry/entity/NSO34-ARIN
             
             OrgTechHandle: NSO34-ARIN
             OrgTechName:   Network Service Owner
             OrgTechPhone:  +07585906307 
             OrgTechEmail:  mike.moyle@wtwco.com
             OrgTechRef:    https://rdap.arin.net/registry/entity/NSO34-ARIN
             
             OrgNOCHandle: NSO34-ARIN
             OrgNOCName:   Network Service Owner
             OrgNOCPhone:  +07585906307 
             OrgNOCEmail:  mike.moyle@wtwco.com
             OrgNOCRef:    https://rdap.arin.net/registry/entity/NSO34-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.
             #

as-report v4.4 (gih) 24/02/14