[REN-BGP-stats-all] IPv4 R&E Routing Table Report - ESnet (R&E) view
REN Routing Table Report
cscora at bgp.nsrc.org
Tue Jul 8 22:20:35 UTC 2025
IPv4 R&E Routing Table Report 22:20 GMT Tue 08 Jul, 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: 19009
Prefixes after maximum aggregation (per Origin AS): 10391
Deaggregation factor: 1.83
Unique aggregates announced (without unneeded subnets): 11536
Number of IPv4 prefixes with a valid ROA: 7964
Number of IPv4 prefixes with an invalid ROA: 1
Number of IPv4 prefixes with no ROA: 11044
Total ASes present in the Internet Routing Table: 2727
Prefixes per ASN: 6.97
Origin-only ASes present in the Internet Routing Table: 2369
Origin ASes announcing only one prefix: 1048
Transit ASes present in the Internet Routing Table: 358
Transit-only ASes present in the Internet Routing Table: 58
Paths with bogon ASNs present in the IPv4 Routing Table: 0
Average AS path length visible in the Internet Routing Table: 3.9
Max AS path length visible: 18
Max AS path prepend of ASN (395156) 12
Prefixes from unregistered ASNs in the Routing Table: 34
Number of instances of unregistered ASNs: 34
Number of 32-bit ASNs allocated by the RIRs: 46788
Number of 32-bit ASNs visible in the Routing Table: 675
Prefixes from 32-bit ASNs in the Routing Table: 1867
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: 167947264
Equivalent to 10 /8s, 2 /16s and 172 /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: 2358
APNIC Region Analysis Summary
-----------------------------
Prefixes being announced by APNIC Region ASes: 4698
Total APNIC prefixes after maximum aggregation: 2276
APNIC Deaggregation factor: 2.06
Prefixes being announced from the APNIC address blocks: 4699
Unique aggregates announced from the APNIC address blocks: 2624
APNIC Region origin ASes present in the Internet Routing Table: 578
APNIC Prefixes per ASN: 8.13
APNIC Region origin ASes announcing only one prefix: 240
APNIC Region transit ASes present in the Internet Routing Table: 52
Average APNIC Region AS path length visible: 3.8
Max APNIC Region AS path length visible: 12
Number of APNIC region 32-bit ASNs visible in the Routing Table: 230
Number of APNIC addresses announced to Internet: 35672576
Equivalent to 2 /8s, 32 /16s and 82 /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: 8365
Total ARIN prefixes after maximum aggregation: 4666
ARIN Deaggregation factor: 1.79
Prefixes being announced from the ARIN address blocks: 8407
Unique aggregates announced from the ARIN address blocks: 5166
ARIN Region origin ASes present in the Internet Routing Table: 1282
ARIN Prefixes per ASN: 6.56
ARIN Region origin ASes announcing only one prefix: 456
ARIN Region transit ASes present in the Internet Routing Table: 156
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: 229
Number of ARIN addresses announced to Internet: 72811520
Equivalent to 4 /8s, 87 /16s and 4 /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: 3546
Total RIPE prefixes after maximum aggregation: 2827
RIPE Deaggregation factor: 1.25
Prefixes being announced from the RIPE address blocks: 3537
Unique aggregates announced from the RIPE address blocks: 2913
RIPE Region origin ASes present in the Internet Routing Table: 656
RIPE Prefixes per ASN: 5.39
RIPE Region origin ASes announcing only one prefix: 294
RIPE Region transit ASes present in the Internet Routing Table: 103
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: 151
Number of RIPE addresses announced to Internet: 53154816
Equivalent to 3 /8s, 43 /16s and 20 /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: 1262
Total LACNIC prefixes after maximum aggregation: 476
LACNIC Deaggregation factor: 2.65
Prefixes being announced from the LACNIC address blocks: 1261
Unique aggregates announced from the LACNIC address blocks: 654
LACNIC Region origin ASes present in the Internet Routing Table: 122
LACNIC Prefixes per ASN: 10.34
LACNIC Region origin ASes announcing only one prefix: 48
LACNIC Region transit ASes present in the Internet Routing Table: 22
Average LACNIC Region AS path length visible: 4.3
Max LACNIC Region AS path length visible: 12
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 56
Number of LACNIC addresses announced to Internet: 3929600
Equivalent to 0 /8s, 59 /16s and 246 /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: 1104
Total AfriNIC prefixes after maximum aggregation: 140
AfriNIC Deaggregation factor: 7.89
Prefixes being announced from the AfriNIC address blocks: 1103
Unique aggregates announced from the AfriNIC address blocks: 177
AfriNIC Region origin ASes present in the Internet Routing Table: 28
AfriNIC Prefixes per ASN: 39.39
AfriNIC Region origin ASes announcing only one prefix: 10
AfriNIC Region transit ASes present in the Internet Routing Table: 8
Average AfriNIC Region AS path length visible: 4.4
Max AfriNIC Region AS path length visible: 18
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 9
Number of AfriNIC addresses announced to Internet: 2376448
Equivalent to 0 /8s, 36 /16s and 67 /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 600 2169 461 SINET-AS Research Organization of Informa
7497 452 180 23 CSTNET-AS-AP Computer Network Information
1237 193 74 145 KREONET-AS-KR KISTI, KR
58647 182 18 2 KAGAWAU-AS Kagawa University, JP
4538 173 2402 81 ERX-CERNET-BKB China Education and Resear
7575 166 281 111 AARNET-AS-AP Australian Academic and Rese
55824 148 19 21 NKN-CORE-NW NKN Core Network, IN
4762 75 4 1 MAHIDOL-BORDER-AS Mahidol University, Tha
6262 63 134 56 CSIRO Commonwealth Scientific and Industr
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 574 491 98 CENIC-2152, US
2920 229 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 86 544 52 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
680 283 1899 249 DFN Verein zur Foerderung eines Deutschen
786 192 1742 186 JANET Jisc Services Limited, GB
559 114 533 104 SWITCH Peering requests: peering at switch.c
8895 109 24 5 ISU Internet Services Unit ISU, SA
1103 96 1231 82 SURFNET-NL SURFnet, The Netherlands, NL
2614 92 26 69 ROEDUNET, RO
137 81 676 76 ASGARR Consortium GARR, IT
3267 80 29 69 NIKS, RU
1930 79 88 74 RCCN Fundacao para a Ciencia e a Tecnolog
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 240 177 41 Rede Nacional de Ensino e Pesquisa, BR
28391 159 10 71 Universidad Juarez Autonoma de Tabasco, M
11340 110 25 52 Red Universitaria Nacional, CL
271640 68 8 1 UNIVERSIDADE FEDERAL DE VICOSA, BR
61468 52 3 21 CEDIA, EC
19611 48 17 2 Associacao Antonio Vieira - Unisinos, BR
2715 46 99 34 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 564 82 3 KENET-AS, KE
2018 375 318 69 TENET-1, ZA
8094 47 48 18 PUKNET, ZA
37215 37 8 1 MAREN, MW
37501 11 49 6 UOFS, ZA
327700 11 16 1 MoRENet, MZ
37654 10 1 6 RwEdNet-AS, RW
36982 8 33 8 UCT, ZA
30983 4 4 1 MARWAN-AS, MA
327798 4 0 3 BERNET, BI
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 600 2169 461 SINET-AS Research Organization of Informa
2152 574 491 98 CENIC-2152, US
36914 564 82 3 KENET-AS, KE
7497 452 180 23 CSTNET-AS-AP Computer Network Information
2018 375 318 69 TENET-1, ZA
680 283 1899 249 DFN Verein zur Foerderung eines Deutschen
1916 240 177 41 Rede Nacional de Ensino e Pesquisa, BR
2920 229 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 564 561 KENET-AS, KE
2152 574 476 CENIC-2152, US
7497 452 429 CSTNET-AS-AP Computer Network Information Cente
2018 375 306 TENET-1, ZA
1916 240 199 Rede Nacional de Ensino e Pesquisa, BR
5786 199 198 UPRENET, PR
2920 229 180 LACOE, US
58647 182 180 KAGAWAU-AS Kagawa University, JP
18558 140 135 NETBLK-RCOEK, US
55824 148 127 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
26971 UNALLOCATED 129.111.0.0/16 276 OTS-AS-276, US
26898 UNALLOCATED 131.187.248.0/22 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.248.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.249.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.250.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 131.187.251.0/24 3112 OARNET-AS-1, US
26898 UNALLOCATED 198.30.187.0/24 3112 OARNET-AS-1, US
22272 UNALLOCATED 206.208.24.0/21 6325 ILLINOIS-CENTURY, US
26898 UNALLOCATED 208.108.80.0/20 3112 OARNET-AS-1, US
26898 UNALLOCATED 208.108.80.0/24 3112 OARNET-AS-1, 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 /16:1923 /17:425 /18:460
/19:574 /20:854 /21:839 /22:1446 /23:1593 /24:10748
/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 543 564 KENET-AS, KE
8895 106 109 ISU Internet Services Unit ISU, SA
2152 66 574 CENIC-2152, US
23024 38 99 OCDE, US
200521 36 60 SEAP-AGE, ES
3267 35 80 NIKS, RU
28614 32 38 Fundacao Universidade Regional de Blumenau, BR
46115 32 35 LUTHER, US
32440 31 57 LONI, US
37215 31 37 MAREN, MW
Complete listing at https://bgp.nsrc.org/REN/ESnet/data-sXXas-nos
Number of /24s announced per /8 block (Global)
----------------------------------------------
1:2 5:16 8:5 12:2 14:93 23:11
24:3 31:1 35:9 37:14 38:13 40:1
41:224 42:18 44:4 45:43 46:5 47:1
49:12 50:4 52:1 58:15 59:20 60:6
61:3 62:6 63:36 64:47 65:20 66:52
67:43 68:19 69:18 70:2 71:1 72:8
74:53 76:36 77:9 78:3 79:9 80:13
81:27 82:6 83:8 84:5 85:51 86:3
87:1 89:10 91:40 92:2 93:14 94:2
95:2 96:5 97:1 98:2 101:3 102:4
103:344 104:77 107:2 108:8 109:6 111:21
113:1 114:21 116:7 117:61 118:33 119:31
121:28 122:8 123:8 124:42 125:5 128:55
129:45 130:97 131:67 132:68 133:156 134:108
136:200 137:105 138:10 139:6 140:32 141:4
142:26 143:26 144:22 145:2 146:136 147:52
148:201 149:10 150:37 151:12 152:127 153:15
154:41 155:81 156:129 157:23 158:25 159:117
160:32 161:15 162:30 163:71 164:9 165:43
166:2 167:28 168:96 169:6 170:26 171:1
172:1 173:6 174:1 175:16 177:5 179:13
180:16 181:1 182:12 184:2 185:52 186:3
187:24 188:16 190:17 191:13 192:1399 193:281
194:121 195:47 196:146 197:353 198:522 199:251
200:299 201:37 202:595 203:433 204:399 205:180
206:203 207:315 208:66 209:175 210:218 211:4
212:151 213:4 216:92 217:22 218:22 219:6
220:16 222:4 223:5
End of report
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