[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ESnet (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Sun Mar 23 22:20:37 UTC 2025
IPv4 R&E Routing Table Report 22:20 GMT Sun 23 Mar, 2025
IPv4 BGP Table (R&E) as seen at ESnet.
Report Website: https://bgp.nsrc.org/REN
Detailed Analysis: https://bgp.nsrc.org/REN/ESnet/
Analysis Summary
----------------
BGP routing table entries examined: 19124
Prefixes after maximum aggregation (per Origin AS): 10415
Deaggregation factor: 1.84
Unique aggregates announced (without unneeded subnets): 11572
Number of IPv4 prefixes with a valid ROA: 7445
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 11678
Total ASes present in the Internet Routing Table: 2745
Prefixes per ASN: 6.97
Origin-only ASes present in the Internet Routing Table: 2388
Origin ASes announcing only one prefix: 1070
Transit ASes present in the Internet Routing Table: 357
Transit-only ASes present in the Internet Routing Table: 56
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 3.8
Max AS path length visible: 20
Max AS path prepend of ASN (395156) 12
Prefixes from unregistered ASNs in the Routing Table: 4
Number of instances of unregistered ASNs: 4
Number of 32-bit ASNs allocated by the RIRs: 46127
Number of 32-bit ASNs visible in the Routing Table: 691
Prefixes from 32-bit ASNs in the Routing Table: 1848
Number of bogon 32-bit ASNs visible in the Routing Table: 0
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 2
Number of addresses announced to Internet: 168306432
Equivalent to 10 /8s, 8 /16s and 39 /24s
Percentage of available address space announced: 4.5
Percentage of allocated address space announced: 4.5
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 99.6
Total number of prefixes smaller than registry allocations: 2292
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 4712
Total APNIC prefixes after maximum aggregation: 2260
APNIC Deaggregation factor: 2.08
Prefixes being announced from the APNIC address blocks: 4713
Unique aggregates announced from the APNIC address blocks: 2610
APNIC Region origin ASes present in the Internet Routing Table: 572
APNIC Prefixes per ASN: 8.24
APNIC Region origin ASes announcing only one prefix: 235
APNIC Region transit ASes present in the Internet Routing Table: 52
Average APNIC Region AS path length visible: 3.6
Max APNIC Region AS path length visible: 12
Number of APNIC region 32-bit ASNs visible in the Routing Table: 226
Number of APNIC addresses announced to Internet: 35720704
Equivalent to 2 /8s, 33 /16s and 14 /24s
APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 63488-64098, 64297-64395, 131072-155961
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 150/8, 153/8,
163/8, 171/8, 175/8, 180/8, 182/8, 183/8, 202/8,
203/8, 210/8, 211/8, 218/8, 219/8, 220/8, 221/8,
222/8, 223/8,
ARIN Region Analysis Summary
----------------------------
Prefixes being announced by ARIN Region ASes: 8498
Total ARIN prefixes after maximum aggregation: 4687
ARIN Deaggregation factor: 1.81
Prefixes being announced from the ARIN address blocks: 8510
Unique aggregates announced from the ARIN address blocks: 5176
ARIN Region origin ASes present in the Internet Routing Table: 1287
ARIN Prefixes per ASN: 6.61
ARIN Region origin ASes announcing only one prefix: 460
ARIN Region transit ASes present in the Internet Routing Table: 157
Average ARIN Region AS path length visible: 3.8
Max ARIN Region AS path length visible: 15
Number of ARIN region 32-bit ASNs visible in the Routing Table: 230
Number of ARIN addresses announced to Internet: 73034240
Equivalent to 4 /8s, 90 /16s and 106 /24s
ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 62464-63487, 64198-64296, 393216-402332
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
54/8, 55/8, 56/8, 63/8, 64/8, 65/8, 66/8,
67/8, 68/8, 69/8, 70/8, 71/8, 72/8, 73/8,
74/8, 75/8, 76/8, 96/8, 97/8, 98/8, 99/8,
100/8, 104/8, 107/8, 108/8, 128/8, 129/8, 130/8,
131/8, 132/8, 134/8, 135/8, 136/8, 137/8, 138/8,
139/8, 140/8, 142/8, 143/8, 144/8, 146/8, 147/8,
148/8, 149/8, 152/8, 155/8, 156/8, 157/8, 158/8,
159/8, 160/8, 161/8, 162/8, 164/8, 165/8, 166/8,
167/8, 168/8, 169/8, 170/8, 172/8, 173/8, 174/8,
184/8, 192/8, 198/8, 199/8, 204/8, 205/8, 206/8,
207/8, 208/8, 209/8, 214/8, 215/8, 216/8,
RIPE Region Analysis Summary
----------------------------
Prefixes being announced by RIPE Region ASes: 3524
Total RIPE prefixes after maximum aggregation: 2823
RIPE Deaggregation factor: 1.25
Prefixes being announced from the RIPE address blocks: 3515
Unique aggregates announced from the RIPE address blocks: 2914
RIPE Region origin ASes present in the Internet Routing Table: 653
RIPE Prefixes per ASN: 5.38
RIPE Region origin ASes announcing only one prefix: 296
RIPE Region transit ASes present in the Internet Routing Table: 101
Average RIPE Region AS path length visible: 3.7
Max RIPE Region AS path length visible: 13
Number of RIPE region 32-bit ASNs visible in the Routing Table: 149
Number of RIPE addresses announced to Internet: 53199616
Equivalent to 3 /8s, 43 /16s and 195 /24s
RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
59392-61439, 61952-62463, 64396-64495
196608-216475
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
53/8, 57/8, 62/8, 77/8, 78/8, 79/8, 80/8,
81/8, 82/8, 83/8, 84/8, 85/8, 86/8, 87/8,
88/8, 89/8, 90/8, 91/8, 92/8, 93/8, 94/8,
95/8, 109/8, 141/8, 145/8, 151/8, 176/8, 178/8,
185/8, 188/8, 193/8, 194/8, 195/8, 212/8, 213/8,
217/8,
LACNIC Region Analysis Summary
------------------------------
Prefixes being announced by LACNIC Region ASes: 1256
Total LACNIC prefixes after maximum aggregation: 471
LACNIC Deaggregation factor: 2.67
Prefixes being announced from the LACNIC address blocks: 1255
Unique aggregates announced from the LACNIC address blocks: 649
LACNIC Region origin ASes present in the Internet Routing Table: 124
LACNIC Prefixes per ASN: 10.12
LACNIC Region origin ASes announcing only one prefix: 50
LACNIC Region transit ASes present in the Internet Routing Table: 21
Average LACNIC Region AS path length visible: 4.3
Max LACNIC Region AS path length visible: 10
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 56
Number of LACNIC addresses announced to Internet: 3937792
Equivalent to 0 /8s, 60 /16s and 22 /24s
LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
61440-61951, 64099-64197, 262144-274844 + ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
191/8, 200/8, 201/8,
AfriNIC Region Analysis Summary
-------------------------------
Prefixes being announced by AfriNIC Region ASes: 1130
Total AfriNIC prefixes after maximum aggregation: 171
AfriNIC Deaggregation factor: 6.61
Prefixes being announced from the AfriNIC address blocks: 1129
Unique aggregates announced from the AfriNIC address blocks: 221
AfriNIC Region origin ASes present in the Internet Routing Table: 50
AfriNIC Prefixes per ASN: 22.58
AfriNIC Region origin ASes announcing only one prefix: 29
AfriNIC Region transit ASes present in the Internet Routing Table: 9
Average AfriNIC Region AS path length visible: 4.2
Max AfriNIC Region AS path length visible: 20
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 30
Number of AfriNIC addresses announced to Internet: 2411776
Equivalent to 0 /8s, 36 /16s and 205 /24s
AfriNIC AS Blocks 36864-37887, 327680-329727 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 154/8, 196/8, 197/8,
APNIC Region per AS prefix count summary
----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 623 2170 463 SINET-AS Research Organization of Informa
7497 452 180 24 CSTNET-AS-AP Computer Network Information
1237 193 74 145 KREONET-AS-KR KISTI, KR
58647 183 18 2 KAGAWAU-AS Kagawa University, JP
4538 176 2404 83 ERX-CERNET-BKB China Education and Resear
7575 168 297 112 AARNET-AS-AP Australian Academic and Rese
55824 147 19 21 NKN-CORE-NW NKN Core Network, IN
4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha
4621 59 35 8 UNINET-AS-AP UNINET-, TH
23570 59 5 11 INCHEON-AS-KR UNIVERSITY OF INCHEON, KR
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-APNIC
ARIN Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
2152 534 507 99 CENIC-2152, US
2920 226 44 49 LACOE, US
376 201 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
18558 140 18 5 NETBLK-RCOEK, US
81 128 471 35 NCREN, US
23024 99 7 17 OCDE, US
21976 88 34 14 NJEDGE-NET, US
237 85 542 51 MERIT-AS-14, US
1736 79 16 1 MU-AS, US
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-ARIN
RIPE Region per AS prefix count summary
---------------------------------------
ASN No of nets /20 equiv MaxAgg Description
680 284 1899 249 DFN Verein zur Foerderung eines Deutschen
786 196 1750 188 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
8895 108 24 5 ISU Internet Services Unit ISU, SA
1103 95 1231 82 SURFNET-NL SURFnet, The Netherlands, NL
2614 90 26 70 ROEDUNET, RO
137 82 677 77 ASGARR Consortium GARR, IT
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
3267 77 26 67 NIKS, RU
553 75 366 75 BELWUE BelWue-Koordination, DE
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-RIPE
LACNIC Region per AS prefix count summary
-----------------------------------------
ASN No of nets /20 equiv MaxAgg Description
1916 236 178 41 Rede Nacional de Ensino e Pesquisa, BR
28391 157 10 69 Universidad Juarez Autonoma de Tabasco, M
11340 110 25 52 Red Universitaria Nacional, CL
271640 67 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR
61468 52 3 21 CEDIA, EC
19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR
2715 44 99 33 Fundacao Carlos Chagas Filho de Amparo a
28614 38 2 2 Fundacao Universidade Regional de Blumena
1251 37 31 26 FUNDACAO DE AMPARO A PESQUISA DO ESTADO S
3596 37 8 4 Universidad Autonoma Metropolitana, MX
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-LACNIC
AfriNIC Region per AS prefix count summary
------------------------------------------
ASN No of nets /20 equiv MaxAgg Description
36914 536 82 3 KENET-AS, KE
2018 374 318 69 TENET-1, ZA
8094 47 48 18 PUKNET, ZA
37215 34 8 1 MAREN, MW
6879 24 2 9 ENSTINET-, EG
37661 12 8 4 NRaE1-AS, NG
37501 11 49 6 UOFS, ZA
327700 10 16 1 MoRENet, MZ
37654 9 1 6 RwEdNet-AS, RW
36982 8 33 8 UCT, ZA
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet-AFRINIC
Global Per AS prefix count summary
----------------------------------
ASN No of nets /20 equiv MaxAgg Description
2907 623 2170 463 SINET-AS Research Organization of Informa
36914 536 82 3 KENET-AS, KE
2152 534 507 99 CENIC-2152, US
7497 452 180 24 CSTNET-AS-AP Computer Network Information
2018 374 318 69 TENET-1, ZA
680 284 1899 249 DFN Verein zur Foerderung eines Deutschen
1916 236 178 41 Rede Nacional de Ensino e Pesquisa, BR
2920 226 44 49 LACOE, US
376 201 162 151 RISQ-AS, CA
5786 199 16 1 UPRENET, PR
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-ASnet
Global Per AS Maximum Aggregation summary
-----------------------------------------
ASN No of nets Net Savings Description
36914 536 533 KENET-AS, KE
2152 534 435 CENIC-2152, US
7497 452 428 CSTNET-AS-AP Computer Network Information Cente
2018 374 305 TENET-1, ZA
5786 199 198 UPRENET, PR
1916 236 195 Rede Nacional de Ensino e Pesquisa, BR
58647 183 181 KAGAWAU-AS Kagawa University, JP
2920 226 177 LACOE, US
18558 140 135 NETBLK-RCOEK, US
55824 147 126 NKN-CORE-NW NKN Core Network, IN
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-CIDRnet
List of Unregistered Origin ASNs (Global)
-----------------------------------------
Bad AS Designation Net Originated Transit AS Transit AS Name
32344 UNALLOCATED 66.158.46.0/24 6325 ILLINOIS-CENTURY, US
32344 UNALLOCATED 66.158.47.0/24 6325 ILLINOIS-CENTURY, US
26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US
22272 UNALLOCATED 206.208.24.0/21 6325 ILLINOIS-CENTURY, US
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-badAS
Advertised Unallocated Addresses
--------------------------------
Unassigned Network ASN Information AS Name
164.160.192.0/21 Origin: 37661 NRaE1-AS, NG
164.160.192.0/21 Transit: 37288 WACREN, SN
203.9.156.0/24 Origin: 1851 ADELAIDE-UNIVERSITY-AS-AP The University
203.9.156.0/24 Transit: 7575 AARNET-AS-AP Australian Academic and Res
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-add-IANA
Number of prefixes announced per prefix length (Global)
-------------------------------------------------------
/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:0 /9:0 /10:0 /11:0 /12:0
/13:0 /14:33 /15:114 /16:1934 /17:418 /18:453
/19:577 /20:858 /21:840 /22:1456 /23:1595 /24:10846
/25:0 /26:0 /27:0 /28:0 /29:0 /30:0
/31:0 /32:0
Advertised prefixes smaller than registry allocations
-----------------------------------------------------
ASN No of nets Total ann. Description
36914 512 536 KENET-AS, KE
8895 105 108 ISU Internet Services Unit ISU, SA
2152 63 534 CENIC-2152, US
23024 38 99 OCDE, US
3267 35 77 NIKS, RU
32440 33 57 LONI, US
28614 32 38 Fundacao Universidade Regional de Blumenau, BR
46115 32 35 LUTHER, US
200521 31 55 SEAP-AGE, ES
25977 30 44 HCCS, US
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:2 5:15 8:5 12:2 14:93 18:42
23:12 24:3 31:1 35:9 37:8 38:12
40:1 41:213 42:18 44:4 45:39 46:4
47:1 49:8 50:4 52:1 58:15 59:20
60:6 61:3 62:6 63:37 64:45 65:19
66:52 67:43 68:18 69:16 70:2 71:1
72:8 74:54 76:36 77:10 78:3 79:9
80:13 81:24 82:6 83:8 84:5 85:50
86:2 87:1 89:10 91:41 92:2 93:14
94:2 95:2 96:5 97:1 98:2 101:3
102:11 103:341 104:77 107:2 108:8 109:5
111:21 113:1 114:24 116:7 117:61 118:33
119:30 121:27 122:8 123:8 124:42 125:5
128:57 129:41 130:99 131:64 132:66 133:157
134:106 136:200 137:98 138:58 139:12 140:31
141:3 142:27 143:25 144:29 145:2 146:137
147:53 148:199 149:11 150:69 151:13 152:127
153:15 154:46 155:80 156:131 157:25 158:11
159:117 160:32 161:15 162:31 163:58 164:10
165:48 166:2 167:29 168:103 169:7 170:27
171:2 172:2 173:5 174:1 175:16 177:7
179:10 180:16 181:1 182:12 184:2 185:49
186:3 187:23 188:14 189:3 190:17 191:13
192:1386 193:290 194:118 195:71 196:147 197:328
198:537 199:249 200:291 201:36 202:629 203:431
204:394 205:177 206:212 207:312 208:67 209:172
210:224 211:4 212:144 213:4 216:92 217:9
218:22 219:6 220:17 222:4 223:4
End of report
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